View source for FidoNet

{{short description|International computer network}}
{{about|the BBS computer network|the industry association standardizing authentication methods|FIDO Alliance}}
{{Redirect|Netmail|the Novell/Messaging Architects server software|M+NetMail}}
{{More citations needed| date = February 2017}}

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                    __
                   /  \
                  /|oo \
                 (_|  /_)
                  _`@/_ \    _
                 |     | \   \\
                 | (*) |  \   ))
    ______       |__U__| /  \//
   / FIDO \       _//|| _\   /
  (________)     (_/(_|(____/
 (c) John Madill

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<div class="thumbcaption">FidoNet logo by John Madill</div>
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'''FidoNet''' is a worldwide [[computer network]] that is used for communication between [[bulletin board system]]s (BBSes). It uses a [[store-and-forward]] system to exchange private (email) and public (forum) messages between the BBSes in the network, as well as other files and protocols in some cases.<ref>{{Cite web|title=Store and Forward Communication: The Prehistory |work=15-849, Fall 2005: Networking in Challenging Environments |last=Andersen |first=David |publisher=Carnegie Mellon University |type=Syllabus |year=2005 |url=https://www.cs.cmu.edu/~dga/15-849/store_and_forward.html |access-date=2025-09-30 |url-status=live |archive-url=https://web.archive.org/web/20250927164827/https://www.cs.cmu.edu/~dga/15-849/store_and_forward.html |archive-date=2025-09-27}}</ref>

The FidoNet system was based on several small interacting programs, only one of which needed to be [[Porting|ported]] to support other BBS software. FidoNet was one of the few networks that was supported by almost all BBS software, as well as a number of non-BBS [[online service]]s. This modular construction also allowed FidoNet to easily upgrade to new [[data compression]] systems, which was important in an era using [[modem]]-based communications over telephone links with high [[long-distance calling]] charges.

The rapid improvement in modem speeds during the early 1990s, combined with the rapid decrease in price of computer systems and storage, made BBSes increasingly popular. By the mid-1990s there were almost 40,000 FidoNet systems in operation, and it was possible to communicate with millions of users around the world. Only [[UUCP#UUCPNET and mapping|UUCPNET]] came close in terms of breadth or numbers; FidoNet's user base far surpassed other networks like [[BITNET]].<ref>{{Cite book|url=https://books.google.com/books?id=fgZ5DwAAQBAJ&pg=PT77 |title=VeriSM ™ - unwrapped and applied|last1=Agutter |first1=Claire |last2=Botha |first2=Johann |last3=Hove |first3=Suzanne D. Van |date=2018 |publisher=Van Haren |isbn=9789401803717|language=en}}</ref>

The broad availability of low-cost [[Internet]] connections starting in the mid-1990s lessened the need for FidoNet's store-and-forward system, as any system in the world could be reached for equal cost. Direct dialing into local BBS systems rapidly declined. Although FidoNet has shrunk considerably since the late 1990s, it has remained in use into 2016<ref>{{cite web |last1=Edwards |first1=Benj |title=The Lost Civilization of Dial-Up Bulletin Board Systems |url=https://www.theatlantic.com/technology/archive/2016/11/the-lost-civilization-of-dial-up-bulletin-board-systems/506465/ |website=The Atlantic|date=4 November 2016 }}</ref> despite internet connectivity becoming more widespread.

==History==

===Origins===
[[File:Pre-nodelist "fido list" June 1984.jpg|thumb|Hand-compiled list of Fido BBS systems, June 1984. This document formed the basis of the first nodelists.]]
There are two major accounts of the development of the FidoNet, differing only in small details.

====Tom Jennings' account====
Around Christmas 1983, [[Tom Jennings]] started work on a new bulletin board system that would emerge as Fido BBS.  It was called "Fido" because the assorted hardware together was "a real mongrel".<ref>{{cite periodical
|title=FidoNet History
|author1=John Madill
|author2=Bart Mullins
|issn=1198-4589
|magazine=FidoNews
|editor=Christopher Baker
|volume=13
|issue=32
|date=5 August 1996
|url=https://www.fidobbs.it/files/fidonews1332.txt
|url-status=live
|access-date=20 December 2021
|archive-url=https://web.archive.org/web/20211220181405/https://www.fidobbs.it/files/fidonews1332.txt
|archive-date=20 December 2021
}}</ref>  Jennings set up the system in [[San Francisco]] sometime in early 1984. Another early user was John Madill, who was trying to set up a similar system in [[Baltimore]] on his [[Rainbow 100]]. Fido started spreading to new systems, and Jennings eventually started keeping an informal list of their phone numbers, with Jennings becoming #1 and Madill #2.<ref name=baker>Ben Baker, [http://www.fidonet.ca/baker.htm "Fidonet History"] {{Webarchive|url=https://web.archive.org/web/20180314014550/http://www.fidonet.ca/baker.htm |date=2018-03-14 }}, 2 May 1987</ref>

Jennings released the first version of the FidoNet software in June 1984. In early 1985 he wrote a document explaining the operations of the FidoNet, along with a short portion on the history of the system. In this version, FidoNet was developed as a way to exchange mail between the first two Fido BBS systems, Jennings' and Madill's, to "see if it could be done, merely for the fun of it". This was first supported in Fido V7, "sometime in June 84 or so".<ref name=tom>Tom Jennings, [http://www.worldpowersystems.com/FidoNet/fidohist1.txt "FidoNet History and Operation"] {{Webarchive|url=https://web.archive.org/web/20140821110859/http://www.worldpowersystems.com/FidoNet/fidohist1.txt |date=2014-08-21 }}, February 1985</ref><ref name="bbsdoc">Jason Scott Sadofsky, "[https://www.imdb.com/title/tt0460402/ BBS: The Documentary]", FIDONET Episode, 21 May 2005.</ref><ref name="byte198410">{{cite news | url=https://archive.org/stream/byte-magazine-1984-10/1984_10_BYTE_09-11_Databases#page/n353/mode/2up | title=FidoNet, Sidekick, Apple, Get Organized!, and Handle | work=BYTE | date=October 1984 | access-date=23 October 2013 |author1=Markoff, John |author2=Shapiro, Ezra | page=357}}</ref>

====Ben Baker's account====
In early 1984, Ben Baker was planning on starting a BBS for the newly forming computer club at the [[McDonnell Douglas]] automotive division in [[St. Louis]]. Baker was part of the [[CP/M]] [[special interest group]] within the club.<ref>Baker provides details of the club and the SIG at about the 8- to 10-minute mark during BBS interviews by Jason Scott Sadofsky, [https://archive.org/details/20040126-bbs-kaplanbakerfrog1 "BBS Documentary Interview Collection: Ben Baker, Ken Kaplan, That Old Frog (Ryugen Fisher) Part 1 (2004)"]</ref> He intended to use the seminal, CP/M-hosted, [[CBBS]] system, and went looking for a machine to run it on. The club's president told Baker that [[Digital Equipment Corporation|DEC]] would be giving them a [[Rainbow 100]] computer on indefinite loan, so he made plans to move the CBBS onto this machine. The Rainbow contained two [[Central processing unit|processors]], an [[Intel 8088]] and a [[Zilog Z80]], allowing it to run both [[MS-DOS]] and [[CP/M]], with the BBS running on the latter. When the machine arrived, they learned that the Z80 side had no access to the [[I/O port]]s, so CBBS could not communicate with a [[modem]]. While searching for software that would run on the MS-DOS side of the system, Baker learned of Fido through Madill.<ref name=baker/>

The Fido software required changes to the serial drivers to work properly on the Rainbow. A porting effort started, involving Jennings, Madill and Baker. This caused all involved to rack up considerable [[Long-distance calling#Categories and charges|long-distance charges]] as they all called each other during development, or called into each other's BBSes to leave email. During one such call "in May or early June", Baker and Jennings discussed how great it would be if the BBS systems could call each other automatically, exchanging mail and files between them.<ref name=baker/> This would allow them to compose mail on their local machines, and then deliver it quickly, as opposed to calling in and typing the message in while on a long-distance telephone connection.<ref name=baker/>

Jennings responded by calling into Baker's system that night and uploading a new version of the software consisting of three files: FIDO_DECV6, a new version of the BBS program itself, FIDONET, a new program, and NODELIST.BBS, a text file. The new version of FIDO BBS had a timer that caused it to exit at a specified time, normally at night. As it exited it would run the separate FIDONET program. NODELIST was the list of Fido BBS systems, which Jennings had already been compiling.<ref name=baker/>

The FIDONET program was what later became known as a ''mailer''. The FIDO BBS software was modified to use a previously unused numeric field in the message headers to store a ''node number'' for the machine to which the message should be delivered to. When FIDONET ran, it would search through the email database for any messages with a number in this field. FIDONET collected all of the messages for a particular node number into a file known as a ''message packet''. After all the packets were generated, one for each node, the FIDONET program would look up the destination node's phone number in NODELIST.BBS, and call the remote system. Provided that FIDONET was running on that system, the two systems would [[Handshake (computing)|handshake]] and, if this succeeded, the calling system would upload its packet, download a return packet if there was one, and disconnect. FIDONET would then unpack the return packet, place the received messages into the local system's database, and move onto the next packet. When there were no remaining packets, FIDONET would exit, and run the FIDO BBS program.<ref>Baker at the 35 minute mark, [https://archive.org/details/20040126-bbs-kaplanbakerfrog1 "BBS Documentary Interview Collection: Ben Baker, Ken Kaplan, That Old Frog (Ryugen Fisher) Part 1 (2004)"]</ref>

In order to lower long-distance charges, the mail exchanges were timed to run late at night, normally 4 AM.<ref name=tom/> This would later be known as ''national mail hour'',<ref name=randy/> and, later still, as ''Zone Mail Hour''.

===Up and running===
By June 1984, Version 7 of the system was being run in production, and nodes were rapidly being added to the network. By August there were almost 30 systems in the nodelist, 50 by September, and over 160 by January 1985. As the network grew, the maintenance of the nodelist became prohibitive, and errors were common. In these cases, people would start receiving phone calls at 4 AM, from a caller that would say nothing and then hang up. In other cases the system would be listed before it was up and running, resulting in long-distance calls that accomplished nothing.<ref name=tom/>

In August 1984, Jennings handed off control of the nodelist to the group in St. Louis, mostly Ken Kaplan and Ben Baker. Kaplan had come across Fido as part of finding a BBS solution for his company, which worked with DEC computers and had been given a Rainbow computer and a [[USRobotics]] 1200bit/s [[modem]].<ref>Kaplan provides details 14 to 16-minute mark during this interview, [https://archive.org/details/20040126-bbs-kaplanbakerfrog1 "BBS Documentary Interview Collection: Ben Baker, Ken Kaplan, That Old Frog (Ryugen Fisher) Part 1 (2004)"]</ref> From then on, joining FidoNet required one to set up their system and use it to deliver a netmail message to a special system, Node 51. The message contained various required contact information. If this message was transmitted successfully, it ensured that at least some of the system was working properly. The nodelist team would then reply with another netmail message back to the system in question, containing the assigned node number. If delivery succeeded, the system was considered to be working properly, and it was added to the nodelist.<ref name=tom/> The first new nodelist was published on 21 September 1984.<ref name=baker/>

===Nets and nodes===
Growth continued to accelerate, and by the spring of 1985, the system was already reaching its limit of 250 nodes. In addition to the limits on the growth of what was clearly a popular system, nodelist maintenance continued to grow more and more time-consuming.<ref name=baker/>

It was also realized that Fido systems were generally clustered – of the fifteen systems running by the start of June 1984, five of them were in St. Louis.<ref name=baker/>  A user on Jennings's system in San Francisco that addressed emails to different systems in St. Louis would cause calls to be made to each of those BBSes in turn. In the United States, local calls were normally free, and in most other countries were charged at a lower rate. Additionally, the initial call setup, generally the first minute of the call, was normally billed at a higher rate than continuing an existing connection. Therefore, it would be less expensive to deliver all the messages from all the users in San Francisco to all of the users in St. Louis in a single call. Packets were generally small enough to be delivered within a minute or two, so delivering all the messages in a single call could greatly reduce costs by avoiding multiple first-minute charges. Once delivered, the packet would be broken out into separate packets for local systems, and delivered using multiple local free calls.

The team settled on the concept of adding a new ''network number'' patterned on the idea of [[area code]]s.<ref group=N>Details of the sequence of events leading to the new routing scheme differ slightly between accounts.</ref> A complete [[network address]] would now consist of the network and node number pair, which would be written with a slash between them. All mail travelling between networks would first be sent to their local ''network host'', someone who volunteered to pay for any long-distance charges. That single site would collect up all the netmail from all of the systems in their network, then re-package it into single packets destined to each network. They would then call any required network admin sites and deliver the packet to them. That site would then process the mail as normal, although all of the messages in the packet would be guaranteed to be local calls.<ref name=baker/>

The network address was placed in an unused field in the Fido message database, which formerly always held a zero. Systems running existing versions of the software already ignored the fields containing the new addressing, so they would continue to work as before; when noticing a message addressed to another node they would look it up and call that system. Newer systems would recognize the network number and instead deliver that message to the network host. To ensure backward compatibility, existing systems retained their original node numbers through this period.<ref name=baker/>

A huge advantage of the new scheme was that node numbers were now unique only within their network, not globally. This meant the previous 250 node limit was gone, but for a variety of reasons this was initially limited to about 1,200. This change also devolved the maintenance of the nodelists down to the network hosts, who then sent updated lists back to Node 51 to be collected into the master list. The St. Louis group now had to only maintain their own local network, and do basic work to compile the global list.<ref name=baker/>

At a meeting held in Kaplan's living room in St. Louis on 11 April 1985<ref group=N>In the interviews, Baker says this took place in May.</ref> the various parties hammered out all of the details of the new concept. As part of this meeting, they also added the concept of a ''region'', a purely administrative level that was not part of the addressing scheme. Regional hosts would handle any stragglers in the network maps, remote systems that had no local network hosts. They then divided up the US into ten regions that they felt would have roughly equal populations.<ref name=baker/>

By May, Jennings had early versions of the new software running. These early versions specified the routing manually through a new ROUTE.BBS file that listed network hosts for each node. For instance, an operator might want to forward all mail to St. Louis through a single node, node 10. ROUTE.BBS would then include a list of all the known systems in that area, with instructions to forward mail to each of those nodes through node 10. This process was later semi-automated by John Warren's NODELIST program.<ref name=tom2>Tom Jennings, [http://www.worldpowersystems.com/FidoNet/fidohist2.txt "FidoNet History #2"] {{Webarchive|url=https://web.archive.org/web/20140821113319/http://www.worldpowersystems.com/FidoNet/fidohist2.txt |date=2014-08-21 }}, 20 August 1985</ref> Over time, this information was folded into updated versions of the nodelist format, and the ROUTES file is no longer used.<ref>{{cite web |url=http://www.bbscorner.com/bbsnetworks/fidonet.htm |title=The Fidonet BBS Network |publisher=Bbscorner.com |date=2010-02-10 |access-date=2014-01-28 |archive-date=2022-02-07 |archive-url=https://web.archive.org/web/20220207224755/http://www.bbscorner.com/bbsnetworks/fidonet.htm |url-status=dead }}</ref>

A new version of FIDO and FIDONET, 10C, was released containing all of these features. On 12 June 1985 the core group brought up 10C, and most Fido systems had upgraded within a few months.<ref name=tom2/> The process went much smoother than anyone imagined, and very few nodes had any problems.<ref name=baker/>

===Echomail===
Sometime during the evolution of Fido, [[email attachment|file attachments]] were added to the system, allowing a file to be referenced from an email message. During the normal exchange between two instances of FIDONET, any files attached to the messages in the packets were delivered after the packet itself had been up or downloaded. It is not clear when this was added, but it was already a feature of the basic system when the 8 February 1985 version of the FidoNet standards document was released, so this was added very early in Fido's history.

At a [[sysop]] meeting in Dallas, the idea was raised that it would be nice if there was some way for the sysops to post messages that would be shared among the systems.<ref name=wagner>{{citation |url=http://www.rxn.com/~net282/fidonet.wagner.echomail.txt |title=History of Echomail |author=Wynn Wagner |archive-url=https://web.archive.org/web/20160210034936/http://www.rxn.com/~net282/fidonet.wagner.echomail.txt |url-status=dead |date=July 1985 |archive-date=2016-02-10 |access-date=2021-12-04}}</ref> In February 1986 Jeff Rush, one of the group members, introduced a new mailer that extracted messages from public forums that the sysop selected, similar to the way the original mailer handled private messages. The new program was known as a ''tosser/scanner''. The tosser produced a file that was similar (or identical) to the output from the normal netmail scan, but these files were then compressed and attached to a normal netmail message as an attachment. This message was then sent to a special address on the remote system. After receiving netmail as normal, the scanner on the remote system looked for these messages, unpacked them, and put them into the same public forum on the original system.<ref name=randy>Randy Bush, [http://www.fidonet.org/inet92_Randy_Bush.txt "FidoNet: Technology, Use, Tools, and History"], 1992</ref>

In this fashion, Rush's system implemented a store and forward public message system similar to [[Usenet]], but based on, and hosted by, the FidoNet system. The first such ''echomail'' forum was one created by the Dallas area sysops to discuss business, known as SYSOP. Another called TECH soon followed. Several public ''echos'' soon followed, including GAYNET and CLANG. These spawned hundreds of new echos, and led to the creation of the Echomail Conference List (Echolist) by Thomas Kenny in January 1987.<ref name=robbins>Frank Robbins, [http://elsmar.com/pdf_files/fidonet-info.txt "FidoNet History Timeline"]</ref> Echomail produced world-spanning shared forums, and its traffic volume quickly surpassed the original netmail system. By the early 1990s, echo mail was carrying over 8 MB of compressed message traffic a day, many times that when uncompressed.<ref name=randy/>

Echomail did not necessarily use the same distribution pathways as normal netmail, and the distribution routing was stored in a separate setup file not unlike the original ROUTES.BBS. At the originating site a header line was added to the message indicating the origin system's name and address. After that, each system that the message traveled through added itself to a growing PATH header, as well as a SEENBY header. SEENBY prevented the message from looping around the network in the case of misconfigured routing information.<ref name=randy/>

Echomail was not the only system to use the file attachment feature of netmail to implement store-and-forward capabilities. Similar concepts were used by online games and other systems as well.

===Zones and points===
The evolution towards the net/node addressing scheme was also useful for reducing communications costs between continents, where time zone differences on either end of the connection might also come into play. For instance, the best time to forward mail in the US was at night, but that might not be the best time for European hosts to exchange. Efforts towards introducing a continental level to the addressing system started in 1986.<ref name=randy/>

At the same time, it was noted that some [[power user]]s were interested in using FidoNet protocols as a way of delivering the large quantities of echomail to their local machines where it could be read offline. These users did not want their systems to appear in the nodelist - they did not (necessarily) run a bulletin board system and were not publicly accessible.<ref name=randy/> A mechanism allowing netmail delivery to these systems without the overhead of nodelist maintenance was desirable.

In October 1986 the last major change to the FidoNet network was released, adding ''zones'' and ''points''. Zones represented major geographical areas roughly corresponding to continents. There were six zones in total, North America, South America, Europe, Oceania, Asia, and Africa. Points represented non-public nodes, which were created privately on a host BBS system. Point mail was delivered to a selected host as if it was addressed to a user on that machine, but then re-packaged into a packet for the point to pick up on-demand. The complete addressing format was now <code>zone:net/node.point</code>, so a real example might be <code>Bob Smith@1:250/250.10</code>.<ref name=randy/> Points were widely used only for a short time, the introduction of [[offline reader]] systems filled this role with systems that were much easier to use. Points remain in use to this day but are less popular than when they were introduced.

===Other extensions===
FidoNet supported file attachments from even the earliest standards. File attachments followed the normal mail routing through multiple systems and could back up transfers all along the line as the files were copied.
Additionally, users could send files to other users and rack up long-distance charges on host systems.
For these reasons, file transfers were normally turned off for most users, and only available to the system operators and tosser/scanners.

A solution was offered in the form of ''file requests''. This reversed the flow of information, instead of being driven by the sending systems, these were driven by the calling system. This meant it was the receiver, the user trying to get the file, that paid for the connection. Additionally, requests were directly routed using one-time point-to-point connections instead of the traditional routing, so they did not cause the file to be copied multiple times. Two such standards became common, "WaZOO" and "Bark", which saw varying support among different mailers. Both worked similarly, with the mailer calling the remote system and sending a new handshake packet to request the files.<ref>Philip Becker [http://www.rxn.com/services/fts/fts-0008.txt "An Enhanced FidoNet Technical Standard Extending FTS-0001 to include Bark requests"] {{Webarchive|url=https://web.archive.org/web/20130520144219/http://www.rxn.com/services/fts/fts-0008.txt |date=2013-05-20 }}, 15 October 1990</ref><ref>Vince Perriello, [http://ftsc.org/docs/fts-0006.002 "YOOHOO and YOOHOO/2U2"], 30 November 1991</ref>

Although FidoNet was, by far, the best known BBS-based network, it was by no means the only one. From 1988 on, [[PCBoard]] systems were able to host similar functionality known as [[RelayNet]], while other popular networks included [[RBBSNet]] from the [[Commodore 64]] world, and [[AlterNet]]. Late in the evolution of the FidoNet system, there was a proposal to allow mail (but not forum messages) from these systems to switch into the FidoNet structure.<ref>Steve Gove, [http://ftsc.org/docs/fsc-0076.001 "A Proposal for NetMail AreaTags"], 3 December 1993</ref> This was not adopted, and the rapid rise of the internet made this superfluous as these networks rapidly added internet exchange, which acted as a [[lingua franca]].

[[File:Fidonodes (en).svg|thumb|Rapid rise, 1996 peak, and slower decline in number of Fidonodes]]

===Peak===
FidoNet started in 1984 and listed 100 nodes by the end of that year. Steady growth continued through the 1980s, but a combination of factors led to rapid growth after 1988. These included faster and less expensive modems and rapidly declining costs of hard drives and computer systems in general. By April 1993, the FidoNet nodelist contained over 20,000 systems. At that time it was estimated that each node had, on average, about 200 active users. Of these 4 million users in total, 2 million users commonly used echomail, the shared public forums, while about 200,000 used the private netmail system.<ref name=randy/> At its peak, FidoNet listed approximately 39,000 systems.<ref name=tom/><ref group=N>The Jargon File puts it at [http://dictionary.reference.com/browse/FidoNet 38,000] at its peak.</ref>

Throughout its lifetime, FidoNet was beset with management problems and infighting. Much of this can be traced to the fact that the inter-net delivery cost real money, and the traffic grew more rapidly than decreases caused by improving modem speeds and downward trending long-distance rates. As they increased, various methods of recouping the costs were attempted, all of which caused friction in the groups. The problems were so bad that Jennings came to refer to the system as the "fight-o-net".<ref>[http://dictionary.reference.com/browse/fight-o-net "fight-o-net"], Jargon File, 4 November 1996</ref>

===Decline===
{{unreferenced section|date=February 2018}}
As modems reached speeds of 28.8&nbsp;kbit/s, dial-up Internet became increasingly common. By 1995, the bulletin board market was reeling as users abandoned local BBS systems in favour of a subscription to a local Internet Provider, which allowed access to worldwide internet services, such as HTTP, internet mail and so on, for the same cost as accessing a local BBS system. Many BBS sysops became Internet Service Providers. Their Internet gateways also made FidoNet less expensive to implement, because inter-net transfers could be delivered over the Internet as well, at little or no marginal cost. But this seriously diluted the entire purpose of the store-and-forward model, which had been built up specifically to address a long-distance problem that no longer existed.

The FidoNet nodelist started shrinking, especially in areas with a widespread availability of internet connections. This downward trend continues but has levelled out at approximately 2,500 nodes.<ref group=N>The exact number can be determined by examining the official nodelist. However, the format is difficult to parse and many systems deliberately appear more than once, in different sections. The 2,500 node limit is an estimate made by the current maintainer as of 2013, Janis Kracht.</ref> FidoNet remains popular in areas where Internet access is difficult to come by, or expensive.

===Resurgence===

Around 2014, [[retrocomputing|a retro movement]] led to a slow increase in internet-connected BBS and nodes. Telnet, rlogin, and SSH are being used between systems. This means the user can telnet to any BBS worldwide as cheaply as ones next door. Also, Usenet and internet mail has been added, along with long file names to many newer versions of BBS software, some being [[freeware]], resulting in increasing use. Nodelists are no longer declining in all cases.

==FidoNet organizational structure==
FidoNet is governed in a hierarchical structure according to FidoNet policy, with designated coordinators at each level to manage the administration of FidoNet nodes and resolve disputes between members.<ref name=policy>{{cite web | url = http://www.fidonet.us/policy4.html | title = FidoNet Policy Document: Version 4.07 | date = June 9, 1989 | publisher = FidoNet | accessdate = 2024-07-04 }}</ref>  The rules of conduct are summed up into these two deliberately vague principles:

# Thou shalt not excessively annoy others.
# Thou shalt not be too easily annoyed.<ref name=policy />

Network coordinators are responsible for managing the individual nodes within their area, usually a city or similar sized area. Regional coordinators are responsible for managing the administration of the network coordinators within their region, typically the size of a state, or small country. Zone coordinators are responsible for managing the administration of all of the regions within their zone. The world is divided into six zones, the coordinators of which elect one of themselves to be the ''International Coordinator'' of FidoNet.

==Technical structure==
FidoNet was historically designed to use modem-based [[Dial-up Internet access|dial-up]] access between bulletin board systems, and much of its policy and structure reflected this.

The FidoNet system officially referred only to the transfer of ''Netmail''&mdash;the individual private messages between people using bulletin boards&mdash;including the protocols and standards with which to support it. A netmail message would contain the name of the person sending, the name of the intended recipient, and the respective FidoNet addresses of each. The FidoNet system was responsible for routing the message from one system to the other (details below), with the bulletin board software on each end being responsible for ensuring that only the intended recipient could read it. Due to the hobbyist nature of the network, any privacy between the sender and recipient was only the result of politeness from the owners of the FidoNet systems involved in the mail's transfer. It was common, however, for system operators to reserve the right to review the content of mail that passed through their system.

Netmail allowed for the ''attachment'' of a single file to every message. This led to a series of ''piggyback'' protocols that built additional features onto FidoNet by passing information back and forth as file attachments. These included the automated distribution of files and transmission of data for inter-BBS games.

By far the most commonly used of these piggyback protocols was ''Echomail'', public discussions similar to [[Usenet]] newsgroups in nature. Echomail was supported by a variety of software that collected up new messages from the local BBSes' public forums (the ''scanner''), compressed it using [[ARC (file format)|ARC]] or [[ZIP (file format)|ZIP]], attached the resulting archive to a Netmail message, and sent that message to a selected system. On receiving such a message, identified because it was addressed to a particular ''user'', the reverse process was used to extract the messages, and a ''tosser'' put them back into the new system's forums.

Echomail was so popular that for many users, Echomail ''was'' the FidoNet. Private person-to-person Netmail was relatively rare.

===Geographical structure===
FidoNet is politically organized into a tree structure, with different parts of the tree electing their respective coordinators. The FidoNet hierarchy consists of ''zones'', ''regions'', ''networks'', ''nodes'' and ''points'' broken down more-or-less geographically.

The highest level is the zone, which is largely continent-based:
* Zone 1 is the [[United States]] and [[Canada]]
* Zone 2 is Europe, Former [[Soviet Union]] countries, and Israel
* Zone 3 is [[Australasia]]
* Zone 4 is [[Latin America]] (except [[Puerto Rico]])
* Zone 5 was [[Africa]]
* Zone 6 was Asia, Israel and the Asian parts of Russia, (which are listed in Zone 2). On 26 July 2007 zone 6 was removed, and all remaining nodes were moved to zone 3.<ref>{{Citation | last = Shenkenberger | first = Carol | editor-last = Felten  | editor-first = Björn | date =  26 July 2007 | publication-date = 30 July 2007 | title = Removal of Zone 6 | periodical = FidoNews | volume =24 | issue= 31 | page = 2 | url = http://www.fidotel.com/public/fidonews/archive/2007/FIDO2431.htm | access-date = 2010-10-08 | quote =With sadness I have removed the last entry for Zone6 as of this writing.  All remaining members have been transitioned to Zone3 as previously determined by Z6 members at large.}}</ref><ref>The message from the 2 zone coordinator Ward Dossche to 50 region coordinator about 6 zone dropping — http://alex-rex.livejournal.com/282920.html {{webarchive |url=https://web.archive.org/web/20120105190446/http://alex-rex.livejournal.com/282920.html |date=January 5, 2012}}</ref>

Each zone is broken down into regions, which are broken down into nets, which consist of individual nodes.  Zones 7-4095 are used for ''othernets''; groupings of nodes that use Fido-compatible software to carry their own independent message areas without being in any way controlled by FidoNet's political structure. Using un-used zone numbers would ensure that each network would have a unique set of addresses, avoiding potential routing conflicts and ambiguities for systems that belonged to more than one network.

===FidoNet addresses===
FidoNet addresses explicitly consist of a ''zone'' number, a ''network'' number (or region number), and a ''node'' number. They are written in the form <code>Zone:Network/Node</code>.{{sfn|Schuyler|1992|loc=Section 4.0}} The FidoNet structure also allows for semantic designation of region, host, and hub status for particular nodes, but this status is not directly indicated by the main address.

For example, consider a node located in [[Tulsa, Oklahoma]], [[United States]] with an assigned node number is 918, located in Zone 1 (North America), Region 19, and Network 170. The full FidoNet address for this system would be <code>1:170/918</code>.  The ''region'' was used for administrative purposes, and was only part of the address if the node was listed directly underneath the Regional Coordinator, rather than one of the networks that were used to divide the region further.

FidoNet policy requires that each FidoNet system maintain a ''nodelist'' of every other member system. Information on each node includes the name of the system or BBS, the name of the node operator, the geographic location, the telephone number, and software capabilities. The nodelist is updated weekly, to avoid unwanted calls to nodes that had shut down, with their phone numbers possibly having been reassigned for voice use by the respective telephone company.

To accomplish regular updates, coordinators of each network maintain the list of systems in their local areas. The lists are forwarded back to the International Coordinator via automated systems on a regular basis. The International Coordinator would then compile a new nodelist, and generate the [[diff|list of changes]] (nodediff) to be distributed for node operators to apply to their existing nodelist.

===Routing of FidoNet mail===
In a theoretical situation, a node would normally forward messages to a ''hub''. The hub, acting as a distribution point for mail, might then send the message to the Net Coordinator. From there it may be sent through a Regional Coordinator, or to some other system specifically set up for the function. Mail to other zones might be sent through a Zone Gate.

For example, a FidoNet message might follow the path:
*1:170/918 ''(node)'' to 1:170/900 ''(hub)'' to 1:170/0 ''(net coordinator)'' to 1:19/0 ''(region coordinator)'' to 1:1/0 ''(zone coordinator)''. From there, it was distributed 'down stream' to the destination node(s).

Originally there was no specific relationship between network numbers and the regions they reside in. In some areas of FidoNet, most notably in Zone 2, the relationship between region number and network number are entwined. For example, 2:201/329 is in Net 201 which is in Region 20 while 2:2410/330 is in Net 2410 which is in Region 24. Zone 2 also relates the node number to the hub number if the network is large enough to contain any hubs. This effect may be seen in the nodelist by looking at the structure of Net 2410 where node 2:2410/330 is listed under Hub 300. This is not the case in other zones.

In Zone 1, things are different.
Zone 1 was the starting point and when Zones and Regions were formed, the existing nets were divided up regionally with no set formula. The only consideration taken was where they were located geographically with respect to the region's mapped outline. As net numbers got added, the following formula was used.

<blockquote>
Region number × 20
</blockquote>
Then when some regions started running out of network numbers, the following was also used.
<blockquote>
Region number × 200
</blockquote>
Region 19, for instance, contains nets 380-399 and 3800–3999 in addition to those that were in Region 19 when it was formed.

Part of the objective behind the formation of local nets was to implement cost reduction plans by which all messages would be sent to one or more hubs or hosts in [[data compression|compressed form]] ([[ARC (file format)|ARC]] was nominally standard, but [[PKZIP]] is universally supported); one toll call could then be made during off-peak hours to exchange entire message-filled archives with an out-of-town uplink for further redistribution.

In practice, the FidoNet structure allows for any node to connect directly to any other, and node operators would sometimes form their own toll-calling arrangements on an ad-hoc basis, allowing for a balance between collective cost saving and timely delivery. For instance, if one node operator in a network offered to make regular toll calls to a particular system elsewhere, other operators might arrange to forward all of their mail destined for the remote system, and those near it, to the local volunteer.  Operators within individual networks would sometimes have cost-sharing arrangements, but it was also common for people to volunteer to pay for regular toll calls either out of generosity or to build their status in the community.

This ad-hoc system was particularly popular with networks that were built on top of FidoNet. Echomail, for instance, often involved relatively large file transfers due to its popularity. If official FidoNet distributors refused to transfer Echomail due to additional toll charges, other node operators would sometimes volunteer. In such cases, Echomail messages would be routed to the volunteers' systems instead.

The FidoNet system was best adapted to an environment in which local [[telephone]] service was inexpensive and long-distance calls (or intercity data transfer via [[packet-switched]] [[computer network|networks]]) costly. Therefore, it fared somewhat poorly in [[Japan]], where even local lines are expensive, or in [[France]], where tolls on local calls and competition with [[Minitel]] or other data networks limited its growth.

===Points===
As the number of messages in Echomail grew over time, it became very difficult for users to keep up with the volume while logged into their local BBS. ''Points'' were introduced to address this, allowing technically savvy users to receive the already compressed and batched Echomail (and Netmail) and read it locally on their own machines.{{sfn|Schuyler|1992|loc=Section 5}}

To do this, the FidoNet addressing scheme was extended with the addition of a final address segment, the point number. For instance, a user on the example system above might be given point number 10, and thus could be sent mail at the address <code>1:170/918.10</code>.

In real-world use, points are fairly difficult to set up. The FidoNet software typically consisted of a number of small utility programs run by manually edited scripts that required some level of technical ability. Reading and editing the mail required either a "sysop editor" program or a BBS program to be run locally.

In North America (Zone 1), where local calls are generally free, the benefits of the system were offset by its complexity. Points were used only briefly, and even then only to a limited degree. Dedicated [[offline mail reader]] programs such as Blue Wave, Squiggy and Silver Xpress (OPX) were introduced in the mid-1990s and quickly rendered the point system obsolete. Many of these packages supported the [[QWK (file format)|QWK]] offline mail standard.

In other parts of the world, especially Europe, this was different. In Europe, even local calls are generally metered, so there was a strong incentive to keep the duration of the calls as short as possible. Point software employs standard compression (ZIP, ARJ, etc.) and so keeps the calls down to a few minutes a day at most. In contrast to North America, pointing saw rapid and fairly widespread uptake in Europe.

Many regions distribute a pointlist in parallel with the nodelist. The pointlist segments are maintained by Net- and Region Pointlist Keepers and the Zone Point List Keeper assembles them into the Zone pointlist. At the peak of FidoNet there were over 120,000 points listed in the Zone 2 pointlist. Listing points is on a voluntary basis and not every point is listed, so how many points there really were is anybody's guess. As of June 2006, there are still some 50,000 listed points. Most of them are in Russia and Ukraine.

===Technical specifications===
FidoNet contained several technical specifications for compatibility between systems.  The most basic of all is ''FTS-0001'',<ref>{{cite web |url=http://ftsc.org/docs/fts-0001.016 |title=FTS-0001 |first=Randy|last=Bush |date=1995-09-30 |format=TXT |website=FidoNet Technical Standards Committee |url-status=live |archive-url=https://web.archive.org/web/20080530024932/http://ftsc.org/docs/fts-0001.016 |archive-date=2008-05-30 }}</ref> with which all FidoNet systems are required to comply as a minimum requirement.  FTS-0001 defined:
*Handshaking - the protocols used by mailer software to identify each other and exchange meta-information about the session.
*Transfer protocol ''([[XMODEM]])'' - the protocols to be used for transferring files containing FidoNet mail between systems.
*Message format - the standard format for FidoNet messages during the time which they were exchanged between systems.

Other specifications that were commonly used provided for ''echomail'', different transfer protocols and handshake methods (''e.g.: Yoohoo/Yoohoo2u2, EMSI''), file compression, nodelist format, transfer over reliable connections such as the Internet ([[Binkp]]), and other aspects.

===Zone mail hour===
Since computer bulletin boards historically used the same [[telephone line]]s for transferring mail as were used for dial-in human users of the BBS, FidoNet policy dictates that at least one designated line of each FidoNet node must be available for accepting mail from other FidoNet nodes during a particular hour of each day.{{sfn|Schuyler|1992|loc=Section 6.0}}

''Zone Mail Hour'', as it was named, varies depending on the geographic location of the node, and was designated to occur during the early morning.  The exact hour varies depending on the time zone, and any node with only one telephone line is required to reject human callers. In practice, particularly in later times, most FidoNet systems tend to accept mail at any time of day when the phone line is not busy, usually during night.

==FidoNet deployments==
{{Unreferenced section|date=November 2017}}
Most FidoNet deployments were designed in a modular fashion.  A typical deployment would involve several applications that would communicate through shared files and directories, and switch between each other through carefully designed [[shell script|scripts]] or [[batch file]]s.  However, [[wiktionary:monolith|monolithic]] software that encompassed all required functions in one package is available, such as D'Bridge.  Such software eliminated the need for custom batch files and is tightly integrated in operation.  The preference for deployment was that of the operator and there were both pros and cons of running in either fashion.

Arguably the most important piece of software on a DOS-based Fido system was the ''[[FOSSIL| FOSSIL driver]]'', which was a small device driver which provided a standard way for the Fido software to talk to the modem.{{sfn|Schuyler|1992|loc=Section 10.0}}  This driver needed to be loaded before any Fido software would work.  An efficient FOSSIL driver meant faster, more reliable connections.

''Mailer software'' was responsible for transferring files and messages between systems, as well as passing control to other applications, such as the BBS software, at appropriate times.  The mailer would initially answer the phone and, if necessary, deal with incoming mail via FidoNet transfer protocols.  If the mailer answered the phone and a human caller was detected rather than other mailer software, the mailer would exit, and pass control to the BBS software, which would then initialise for interaction with the user.  When outgoing mail was waiting on the local system, the mailer software would attempt to send it from time to time by dialing and connecting to other systems who would accept and route the mail further.  Due to the costs of toll calls which often varied between peak and off-peak times, mailer software would usually allow its operator to configure the optimal times in which to attempt to send mail to other systems.

''BBS software'' was used to interact with human callers to the system.  BBS software would allow dial-in users to use the system's message bases and write mail to others, locally or on other BBSes.  Mail directed to other BBSes would later be routed and sent by the mailer, usually after the user had finished using the system.  Many BBSes also allowed users to exchange files, play games, and interact with other users in a variety of ways (i.e.: node to node chat).

A ''scanner/tosser'' application, such as [[FastEcho]], [[FMail]], [[TosScan]] and Squish, would normally be invoked when a BBS user had entered a new FidoNet message that needed to be sent, or when a mailer had received new mail to be imported into the local messages bases.  This application would be responsible for handling the packaging of incoming and outgoing mail, moving it between the local system's message bases and the mailer's inbound and outbound directories.  The scanner/tosser application would generally be responsible for basic routing information, determining which systems to forward mail to.

In later times, ''message readers'' or ''editors'' that were independent of BBS software were also developed.  Often the System Operator of a particular BBS would use a devoted message reader, rather than the BBS software itself, to read and write FidoNet and related messages. One of the most popular editors in 2008 was [[GoldED+]].  In some cases, FidoNet nodes, or more often FidoNet points, had no public bulletin board attached and existed only for the transfer of mail for the benefit of the node's operator. Most nodes in 2009 had no BBS access, but only points, if anything.

The original ''Fido BBS'' software, and some other FidoNet-supporting software from the 1980s, is no longer functional on modern systems.  This is for several reasons, including problems related to the [[Y2K bug]].  In some cases, the original authors have left the [[Bulletin board system|BBS]] or [[shareware]] community, and the software, much of which was [[closed source]], is no longer supported.

Several DOS-based legacy FidoNet Mailers such as [[FrontDoor]], Intermail, MainDoor and D'Bridge from the early 1990s can still be run today under Windows without a modem, by using the freeware [[NetFoss]] Telnet [[FOSSIL]] driver, and by using a Virtual Modem such as NetSerial. This allows the mailer to ''dial'' an IP address or hostname via Telnet, rather than dialing a real [[Plain old telephone service|POTS]] phone number. There are similar solutions for Linux such as MODEMU (modem emulator) which has limited success when combined with [[DOSEMU]] (DOS emulator).
Mail Tossers such as FastEcho and FMail are still used today under both Windows and Linux/DOSEMU.

[[File:Qcc-0.57.1xe master queue.png|thumb|File queue in qcc, the ncurses UI for qico. The addresses are made-up.]]
There are several modern Windows-based FidoNet Mailers available today with source code, including Argus, Radius, and Taurus. MainDoor is another Windows-based Fidonet mailer, which also can be run using either a modem or directly over TCP/IP. Two popular [[free and open source software]] FidoNet mailers for [[Unix-like]] systems are the [[binkd]] (cross-platform, IP-only, uses the [[binkp]] protocol) and qico (supports modem communication as well as the IP protocol of ifcico and binkp).

On the ''hardware'' side, Fido systems were usually well-equipped machines, for their day, with quick CPUs, high-speed modems and [[16550 UART|16550]] UARTs, which were at the time an upgrade.  As a Fidonet system was usually a BBS, it needed to quickly process any new mail events before returning to its 'waiting for call' state. In addition, the BBS itself usually necessitated lots of storage space.  Finally, a FidoNet system usually had at least one dedicated phone line.  Consequently, operating a Fidonet system often required significant financial investment, a cost usually met by the owner of the system.

== FidoNet availability ==
While the use of FidoNet has dropped dramatically compared with its use up to the mid-1990s, it is still used{{as of?|date=May 2025}} in many countries and especially [[Russia]] and former republics of the USSR.{{Citation needed|date=April 2012}}  Some BBSes, including those that are now available for users with [[Internet]] connections via [[telnet]], also retain their FidoNet netmail and echomail feeds.

Some of FidoNet's echomail conferences are available via gateways with the Usenet news hierarchy using software like UFGate.  There are also mail gates for exchanging messages between Internet and FidoNet.  Widespread net abuse and [[e-mail spam]] on the Internet side has caused some gateways (such as the former 1:1/31 [[IEEE]] fidonet.org gateway) to become unusable or cease operation entirely.

== FidoNews==
''FidoNews'' is the [[online journal|newsletter]] of the FidoNet community.  Affectionately nicknamed ''The Snooze'', it is published weekly.  It was first published in 1984.  Throughout its history, it has been published by various people and entities, including the short-lived International FidoNet Association. From January 2002 it has been published by Björn Felten, Sweden.

==See also==
<!-- * [[fsxNet]] -->
<!-- * [[Fruity Dog]] -->
* [[PODSnet]]
* [[RelayNet]]
* [[UUCP]]

==References==
;Notes
{{reflist|group=N}}

;Citations
{{reflist|30em}}

== Further reading ==
{{refbegin}}
* {{cite web|url = http://www.fidonet.us/dummyguide.html|title = The Big Dummy's Guide to FidoNet|last = Schuyler|first = Michael|date=November 1992|publisher  = FidoNet|access-date  = 2010-09-30}}
* {{cite video | people = [[Jason Scott|Scott, Jason (director)]] | date = 2005 | title = BBS: The Documentary | url = http://www.bbsdocumentary.com/ | medium = DVD, Episode 4: "Fidonet" | publisher = Bovine Ignition Systems | location = Boston, MA, USA | archive-url  = https://web.archive.org/web/20080511160850/http://www.bbsdocumentary.com/ | archive-date = 2008-05-11 | access-date = 2010-08-01 | oclc = 61156153 }} [https://archive.org/details/BBS.The.Documentary Alt URL]
{{refend}}

== External links ==
{{commons category}}
* {{Official website|http://www.fidonet.org/ }}
* [http://www.fidonet.us/ Alternate US FidoNet Home Page]
* [http://www.ftsc.org/ FidoNet Technical Standards Committee Home Page]
* [https://web.archive.org/web/20050124105035/http://fidonews.org/ FidoNews, the weekly newsletter of the FidoNet community]
* [https://web.archive.org/web/20010511145808/http://www.tlchost.net/echolist/ International Echolist Home Page]
* [http://www.filegate.net/ IFDC FileGate Project]
* [https://web.archive.org/web/20090325213820/http://winramturbo.com/fnsp/ Fidonet Showcase Project]

{{BBS}}
{{Computer-mediated communication}}
{{Telecommunications}}

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