View source for List of assigned /8 IPv4 address blocks

{{Short description|none}}
Some large [[IPv4 subnetting reference|{{IPaddr||8}} blocks]] of [[IPv4 address]]es, the former [[Classful network|Class A]] network blocks, are assigned in whole to single organizations or related groups of organizations, either by the [[Internet Corporation for Assigned Names and Numbers]] (ICANN), through the [[Internet Assigned Numbers Authority]] (IANA), or a [[regional Internet registry]].

Each {{IPaddr||8}} block contains 256{{sup|3}} = 2{{sup|24}} = 16,777,216 addresses, which covers the whole range of the last three delimited segments of an IP address. This means that 256 /8 address blocks fit into the entire IPv4 space.

As [[IPv4 address exhaustion]] has advanced to its final stages, some organizations, such as [[Stanford University]], formerly using {{IPaddr|36.0.0.0|8}}, have returned their allocated blocks (in this case to [[APNIC]]) to assist in the delay of the exhaustion date.

==List of reserved /8 blocks==
{{see also|Reserved IP addresses}}
{| class="wikitable sortable"
! Block !! Organization !! [[Internet Assigned Numbers Authority|IANA]] date !! [[Regional Internet registry|RIR]] date !! Notes
|-
| 0.0.0.0/8 || [[Internet Assigned Numbers Authority|IANA]]{{dash}}Local Identification || 1981-09 || || Originally IANA{{dash}}Reserved 1981-09. 0.0.0.0/8 reserved for self-identification.{{Ref RFC|6890}}
|-
| 10.0.0.0/8 || IANA{{dash}}Private Use || 1995-06 || || Reserved for [[Private network|Private Networks]].{{Ref RFC|1918}}  Formerly [[ARPANET]].{{Ref RFC|790}}
|-
| 127.0.0.0/8 || [[Internet Assigned Numbers Authority|IANA]]{{dash}}Loopback || 1981-09 ||  || 127.0.0.0/8 is reserved for [[loopback]].{{Ref RFC|6890}}
|-
| 224.0.0.0/8–239.0.0.0/8 || [[Multicast]] || 1981-09 || 1991-05-22 || [[IP multicast|Multicast]] (formerly "[[Classful network|Class D]]"{{Ref RFC|5771}}) registered in [https://www.iana.org/assignments/multicast-addresses].
|-
| 240.0.0.0/8–255.0.0.0/8 || Future Use || 1981-09 ||  || Reserved for future use (formerly "Class E"{{Ref RFC|1112}}). 255.255.255.255 is reserved for "limited broadcast" destination address.{{Ref RFC|919}}{{Ref RFC|922}}
|}

==List of assigned /8 blocks to commercial organizations==
{| class="wikitable sortable"
|-
! Block !! Organization !! [[Internet Assigned Numbers Authority|IANA]] date !! [[Regional Internet registry|RIR]] date !! Notes
|-
| 12.0.0.0/8 || [[AT&T|AT&T Services]] || 1995-06 || 1983-08-23 || Originally [[AT&T Bell Laboratories]], but retained by AT&T when Bell Labs was spun off to [[Lucent|Lucent Technologies]] in 1996. Assignment administered by ARIN (Legacy space)
|-
| 17.0.0.0/8 || [[Apple Inc.]] || 1992-07 || 1990-04-16 ||Assignment administered by ARIN (Legacy space)
|-
| 19.0.0.0/8 || [[Ford Motor Company]] || 1995-05 || 1988-06-15 ||Assignment administered by ARIN (Legacy space)
|-
| 38.0.0.0/8 || [[Cogent Communications]] || 1994-09 || 1991-04-16 || Formerly [[PSINet]]. Assignment administered by ARIN (Legacy space)
|-
|53.0.0.0/8
|[[Mercedes-Benz Group|Mercedes-Benz Group AG]]
|1993-10
|1970-01-01
|Assignment administered by RIPE (Legacy space)
|-
| 73.0.0.0/8 || [[Comcast|Comcast Corporation]]<ref>{{cite web | url=https://whois.arin.net/rest/net/NET-73-0-0-0-1.html | title=Whois-RWS }}</ref> || N/A || 2005-04-19 ||Assignment administered by ARIN.
|}

==List of assigned /8 blocks to the [[United States Department of Defense]]==
{| class="wikitable sortable"
|-
! Block !! Organization !! [[Internet Assigned Numbers Authority|IANA]] date !! [[Regional Internet registry|RIR]] date !! Notes
|-
| 6.0.0.0/8 || [[United States Department of Defense|Army Information Systems Center]] || 1994-02 || 1994-02-01 || Headquarters, [[USAISC]]
|-
| 7.0.0.0/8 || [[United States Department of Defense|DoD Network Information Center]] || 1995-04 || 1997-11-24 || Formerly IANA - Reserved 1995-04.<br />Entirely assigned to [[United States Department of Defense|DoD]] Network Information Center (DNIC) 1997-11-24.<br />Updated to Administered by ARIN not before 2007.
|-
| 11.0.0.0/8 || [[United States Department of Defense|DoD]] Intel Information Systems || 1993-05 || 1984-01-19 ||
|-
| 21.0.0.0/8 || [[United States Department of Defense|DDN-RVN]] || 1991-07 || 1991-07-01 || DoD Network Information Center (DNIC)
|-
| 22.0.0.0/8 || [[Defense Information Systems Agency]]|| 1993-05 || 1989-06-26 || DoD Network Information Center (DNIC)
|-
| 26.0.0.0/8 || [[Defense Information Systems Agency]]|| 1995-05 || 1995-05-01 || DoD Network Information Center (DNIC)
|-
| 28.0.0.0/8 || [[United States Department of Defense|DSI-North]] || 1992-07 || || DoD Network Information Center (DNIC)
|-
| 29.0.0.0/8 || [[Defense Information Systems Agency]]|| 1991-07 || 1991-07-01 || DoD Network Information Center (DNIC)
|-
| 30.0.0.0/8 || [[Defense Information Systems Agency]]|| 1991-07 || 1991-07-01 || DoD Network Information Center (DNIC)
|-
| 33.0.0.0/8 || [[United States Department of Defense|DLA Systems Automation Center]] || 1991-01 || 1991-01-01 || DoD Network Information Center (DNIC)
|-
| 55.0.0.0/8 || [[United States Department of Defense|DoD Network Information Center]] || 1995-04 || 1996-10-26 || Headquarters, USAISC. Formerly Boeing Computer Services 1995-04.<br />Updated to DoD Network Information Center in 2007-02.
|-
| 214.0.0.0/8 || US-DOD || 1998-03 || 1998-03-27 || DoD Network Information Center (DNIC)
|-
| 215.0.0.0/8 || US-DOD || 1998-03 || 1998-06-05 || DoD Network Information Center (DNIC)
|}

==List of assigned /8 blocks to the regional Internet registries==
[[File:Regional Internet Registries world map.svg|thumb|upright=1.2|Map of regional Internet registries]]
The [[Regional Internet registry|regional Internet registries]] (RIRs) allocate [[Internet number|IP]]s within a particular region of the world.

{| class="wikitable sortable"
|-
! Block !! Organization !! [[Internet Assigned Numbers Authority|IANA]] date !! [[Regional Internet registry|RIR]] date !! Notes
|-
| 1.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - reserved 1981-09.
|-
| 2.0.0.0/8 || [[RIPE NCC]] || 2009-10 ||  || Formerly IANA - reserved 1981-09.
|-
|3.0.0.0/8
|[[ARIN]]
|1994-05
|
|[[Amazon.com]].<ref>{{cite web|url=https://news.ycombinator.com/item?id=18407173 |title=Tell HN: Amazon now owns 3.0.0.0/8 |website=Hacker News}}{{Self-published source|date=September 2023}}</ref> Formerly [[General Electric|General Electric Company]].
|-
|4.0.0.0/8
|[[ARIN]]
|1992-12
|
|Various registries (maintained by ARIN). Formerly [[BBN Technologies|Bolt Beranek and Newman Inc.]], then [[GTE]], then [[Genuity (Internet company)|Genuity]], then [[Level 3 Communications|Level&nbsp;3 Communications, Inc.]]
|-
| 5.0.0.0/8 || [[RIPE NCC]] || 2010-11 ||  || Formerly IANA - reserved 1995-07.
|-
|8.0.0.0/8
|[[ARIN]]
|1992-12
|1992-12-01
|Various registries (maintained by ARIN).  Formerly [[BBN Technologies|Bolt Beranek and Newman Inc.]], then [[GTE]], then [[Genuity (Internet company)|Genuity]], then [[Level 3 Communications|Level&nbsp;3 Communications, Inc.]]
|-
|9.0.0.0/8
|[[ARIN]]
|1992-08
|
|[[IBM]] except for 9.9.9.0/24, which is [[Quad9]].
|-
|13.0.0.0/8
|[[ARIN]]
|1991-09
|
|Various registries (maintained by ARIN). Formerly [[Xerox]].
|-
| 14.0.0.0/8 || [[APNIC]] || 2010-04 || || Starting 1991-06-01, was used to map Public Data Network ([[X.121]]) addresses to IP addresses. Returned to IANA 2008-01-22. This network was reclaimed by IANA in 2007 and was subsequently re-allocated in 2010. See RFC 877 and RFC 1356 for historical information.<ref>{{cite web |url=https://www.iana.org/assignments/public-data-network-numbers |title=Public Data Network Numbers |date=24 June 2010 |publisher=[[Internet Assigned Numbers Authority]] |access-date=27 March 2011}}</ref>
|-
|15.0.0.0/8
|[[ARIN]]
|1991-09
|
|Various registries (maintained by ARIN). Formerly [[Hewlett-Packard|Hewlett-Packard Company]]. [[HP Inc.|HP Inc]] still uses a portion of the block. 
|-
|16.0.0.0/8
|[[ARIN]]
|1994-11
|1989-05-18
|Various registries (maintained by ARIN). Formerly [[Digital Equipment Corporation]], then [[Compaq]], then Hewlett-Packard.
|-
|18.0.0.0/8
|[[ARIN]]
|1994-01
|
|Various registries (maintained by ARIN). Formerly [[Massachusetts Institute of Technology|MIT]].
|-
|20.0.0.0/8
|[[ARIN]]
|1994-10
|
|Various registries (maintained by ARIN). Formerly [[DXC Technology]]. [[Computer Sciences Corporation]], who owned this block, merged with [[Hewlett Packard Enterprise Services|HP Enterprise Services]] to create [[DXC Technology]] on 3 April 2017.<ref>{{cite web|url=http://www.businesswire.com/news/home/20160524006613/en/CSC-Announces-Merger-Enterprise-Services-Segment-Hewlett|title=CSC Announces Merger with Enterprise Services Segment of Hewlett Packard Enterprise to create a Global IT Services Leader|date=24 May 2016|work=Press release|access-date=4 November 2016}}</ref><ref>{{cite web |url=https://www.nyse.com/network/article/nyse-dxc |title=New York Stock Exchange {{!}} DXC Technology |website=www.nyse.com |url-status=dead |archive-url=https://web.archive.org/web/20170406022954/https://www.nyse.com/network/article/nyse-dxc |archive-date=2017-04-06}} </ref>
|-
| 23.0.0.0/8 || [[ARIN]] || 2010-11 ||  || Formerly IANA - reserved 1995-07.
|-
| 24.0.0.0/8 || [[ARIN]] || 2001-05 || 2001-05-01 || Formerly IANA - Cable Block 1995-07, then ARIN - Cable Block 2001-05.<ref>{{cite web |url=https://www.iana.org/assignments/network-24 |title=Network 24 - Cable Block |date=11 May 2001 |publisher=[[Internet Assigned Numbers Authority]] |access-date=27 March 2011 |url-status=dead |archive-url=https://web.archive.org/web/20110627053427/https://www.iana.org/assignments/network-24 |archive-date=27 June 2011 }}</ref> Updated to ARIN not before 2007.
|-
| 25.0.0.0/8 || [[RIPE NCC]] || 1995-01
| || As of 2005-08-23 entire block assigned to [[Ministry of Defence (United Kingdom)|UK Ministry of Defence]] <!-- previously listed as [[Ministry of Defence (United Kingdom)|UK Ministry of Defence]] || 1995-01 || 1985-01-28 || Originally Royal Signals and Radar Establishment. Updated to UK Ministry of Defence in 2006-01. -->
|-
| 27.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - reserved 1995-04.
|-
| 31.0.0.0/8 || [[RIPE NCC]] || 2010-05 || 2010-05-18 || Formerly IANA - reserved 1991-04.
|-
|32.0.0.0/8
|[[ARIN]]
|1994-06
|
|Various registries (maintained by ARIN). Formerly [[AT&T|AT&T Global Network Services]]. Originally Norsk Informasjonsteknologi (at that time maintained by [[RIPE NCC]]). [[IBM]] acquired Norsk Informasjonsteknologi (Norway) in 1995.
|-
|34.0.0.0/8
|[[ARIN]]
|1993-03
|
|Various registries (maintained by ARIN). Formerly [[Halliburton|Halliburton Company]].
|-
| 35.0.0.0/8 || [[ARIN]] || 1994-04 || 2012-08 || Various registries (Maintained by ARIN). Formerly [[Merit Network]] 1986.
|-
| 36.0.0.0/8 || [[APNIC]] || 2010-10 ||  || Formerly [[Stanford University]] 1993-04, then IANA - Reserved 2000-07.
|-
| 37.0.0.0/8 || [[RIPE NCC]] || 2010-11 ||  || Formerly IANA - Reserved 1995-04.
|-
| 39.0.0.0/8 || [[APNIC]] || 2011-01 ||  || Formerly IANA - Reserved 1995-04.
|-
|40.0.0.0/8
|[[ARIN]]
|1994-06
|
|Various registries (Maintained by ARIN).
|-
| 41.0.0.0/8 || [[AFRINIC]] || 2005-04 ||  || Formerly IANA - Reserved 1995-05.
|-
| 42.0.0.0/8 || [[APNIC]] || 2010-10 ||  || Formerly IANA - Reserved 1995-07.
|-
| 43.0.0.0/8 || [[APNIC]] || 1991-01 || 1989-02-21 || Various registries (Maintained by APNIC). Originally Japan Inet 1991-01 (IANA date) or 1989-02-21 (RIR date). Administered by APNIC not before 2007.
|-
| [[44.0.0.0/8]] || [[ARIN]] || 1992-07 || 2019-07-18 || Various registries (Maintained by ARIN). Originally [[Amateur Radio Digital Communications]]. {{IPaddr|44.192.0.0|10}} was sold to [[Amazon (company)|Amazon]] on 2019-07-18.<ref>{{cite web | url=https://www.ampr.org/amprnet/ | title=AMPRNet &#124; Amateur Radio Digital Communications }}</ref>
|-
| 45.0.0.0/8 || [[ARIN]] || 1995-01 || 1991-09-09 || Various registries (Maintained by ARIN). Formerly [[Interop|Interop Show Network]] 1995-01 or 1991-09-09 (RIR date). Returned to ARIN in 2010-10 except a /15 block. In 2011 it became available for distribution (or possibly be returned to the IANA, depending on the global policy in effect at that time).<ref>{{cite web |url=https://www.arin.net/resources/request/ipv4_depletion.html |title=IPv4 IANA Free Pool Depletion – FAQ |publisher=[[American Registry for Internet Numbers]] |access-date=27 March 2011 |archive-url=https://web.archive.org/web/20110628195409/https://www.arin.net/resources/request/ipv4_depletion.html |archive-date=28 June 2011 |url-status=dead }}</ref>
|-
| 46.0.0.0/8 || [[RIPE NCC]] || 2009-09 || || Formerly [[BBN Technologies|Bolt Beranek and Newman Inc.]] 1992-12. Returned to IANA in 2007-04.<ref>{{cite journal |last1=van Beijnum |first1=Iljitsch |journal=The Internet Protocol Journal |date=September 2007 |title=IPv4 Address Space: 2.46 Billion Down, 1.25 Billion to Go |volume=10 |issue=3 |url=https://ipj.dreamhosters.com/wp-content/uploads/issues/2007/ipj10-3.pdf |access-date=2024-04-20 |pages=22–28 |issn=1944-1134}}</ref> Updated to IANA - Reserved in 2007-04.
|-
| 47.0.0.0/8 || [[ARIN]] ||  1991-01
|  || Various registries (Maintained by ARIN). Formerly Bell-Northern Research, which became Northern Telecom, aka, Nortel, until its demise, circa 2010.
|-
| 48.0.0.0/8 || [[ARIN]] || 2023-10-02 || 1990-12-07 || Assignment administered by ARIN (Legacy space). Formerly [[Prudential Financial]], who still use a portion of the space.
|-
| 49.0.0.0/8 || [[APNIC]] || 2010-08 ||  || Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05.
|-
| 50.0.0.0/8 || [[ARIN]] || 2010-02 ||  || Formerly Joint Technical Command (Returned to IANA Mar 98) 1994-05. Updated to IANA - Reserved in 2007-05.
|-
| 51.0.0.0/8 || [[RIPE NCC]] || 1994-08
| || Various registries (Maintained by RIPE NCC). Formerly [[Department for Work and Pensions|UK Government Department for Work and Pensions]]. <!-- formerly listed as [[Department for Work and Pensions|UK Government Department for Work and Pensions]] || 1994-08 || 1991-09-16 -->
|-
|52.0.0.0/8
|[[ARIN]]
|1991-12
|
| Formerly [[DuPont]].
|-
|54.0.0.0/8
|[[ARIN]]
|1992-03
|
|Various registries (Maintained by ARIN).<!-- formerly listed as Cap Debis CCS || 1993-10 || 1992-03-17 || Cap Debis CCS ([[Daimler AG]]). -->
|-
| 56.0.0.0/8 || [[ARIN]] || 1992-11
| || Formerly United States Postal Service.
|-
| 57.0.0.0/8 || [[RIPE NCC]] || 1995-05
| || Formerly [[SITA (IT company)|SITA]]. <!-- formerly listed as "| 57.0.0.0/8 || [[SITA (IT company)|SITA]] || 1995-05 || 1993-06-21 ||" in a different section of this document. -->
|-
|58.0.0.0/8
|[[APNIC]]
|2004-04
|
|
|-
|59.0.0.0/8
|[[APNIC]]
|2004-04
|
|
|-
| 60.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
| 61.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
|62.0.0.0/8
|[[RIPE NCC]]
|1997-04
|
|
|-
|63.0.0.0/8
|[[ARIN]]
|1997-04
|
|
|-
|64.0.0.0/8
|[[ARIN]]
|1999-07
|
|
|-
|65.0.0.0/8
|[[ARIN]]
|2000-07
|
|
|-
|66.0.0.0/8
|[[ARIN]]
|2000-07
|
|
|-
|67.0.0.0/8
|[[ARIN]]
|2001-05
|
|
|-
|68.0.0.0/8
|[[ARIN]]
|2001-06
|
|
|-
|69.0.0.0/8
|[[ARIN]]
|2002-08
|
|
|-
|70.0.0.0/8
|[[ARIN]]
|2004-01
|
|
|-
|71.0.0.0/8
|[[ARIN]]
|2004-08
|
|
|-
|72.0.0.0/8
|[[ARIN]]
|2004-08
|
|
|-
|74.0.0.0/8
|[[ARIN]]
|2005-06
|
|
|-
|75.0.0.0/8
|[[ARIN]]
|2005-06
|
|
|-
|76.0.0.0/8
|[[ARIN]]
|2005-06
|
|
|-
|77.0.0.0/8
|[[RIPE NCC]]
|2006-08
|
|
|-
|78.0.0.0/8
|[[RIPE NCC]]
|2006-08
|
|
|-
|79.0.0.0/8
|[[RIPE NCC]]
|2006-08
|
|
|-
|80.0.0.0/8
|[[RIPE NCC]]
|2001-04
|
|
|-
|81.0.0.0/8
|[[RIPE NCC]]
|2001-04
|
|
|-
|82.0.0.0/8
|[[RIPE NCC]]
|2002-11
|
|
|-
|83.0.0.0/8
|[[RIPE NCC]]
|2003-11
|
|
|-
|84.0.0.0/8
|[[RIPE NCC]]
|2003-11
|
|
|-
|85.0.0.0/8
|[[RIPE NCC]]
|2004-04
|
|
|-
|86.0.0.0/8
|[[RIPE NCC]]
|2004-04
|
|
|-
|87.0.0.0/8
|[[RIPE NCC]]
|2004-04
|
|
|-
| 88.0.0.0/8 || [[RIPE NCC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
|89.0.0.0/8
|[[RIPE NCC]]
|2005-06
|
|
|-
|90.0.0.0/8
|[[RIPE NCC]]
|2005-06
|
|Except for 90.0.0.0/9, which is [[Orange S.A.|Orange]]
|-
|91.0.0.0/8
|[[RIPE NCC]]
|2005-06
|
|
|-
|92.0.0.0/8
|[[RIPE NCC]]
|2007-03
|
|
|-
|93.0.0.0/8
|[[ARIN]]
|1994-05
|
|[[Fastweb (telecommunications company)|Fastweb]].<ref>{{cite web|url=https://it.wikipedia.org/wiki/Fastweb |title=Fastweb }}</ref>{{Circular reference|date=February 2025}}
|-
|94.0.0.0/8
|[[RIPE NCC]]
|2007-07
|
|
|-
|95.0.0.0/8
|[[RIPE NCC]]
|2007-07
|
|
|-
|96.0.0.0/8
|[[ARIN]]
|2006-10
|
|
|-
|97.0.0.0/8
|[[ARIN]]
|2006-10
|
|
|-
|98.0.0.0/8
|[[ARIN]]
|2006-10
|
|
|-
|99.0.0.0/8
|[[ARIN]]
|2006-10
|
|
|-
|100.0.0.0/8
|[[ARIN]]
|2010-11
|
|100.64.0.0/10 reserved for [[Carrier-grade NAT]] (detailed in {{IETF RFC|6598}}).
|-
|101.0.0.0/8
|[[APNIC]]
|2010-08
|
|
|-
|102.0.0.0/8
|[[AFRINIC]]
|2011-02
|
|
|-
|103.0.0.0/8
|[[APNIC]]
|2011-02
|
|
|-
|104.0.0.0/8
|[[ARIN]]
|2011-02
|
|
|-
|105.0.0.0/8
|[[AFRINIC]]
|2010-11
|
|
|-
|106.0.0.0/8
|[[APNIC]]
|2011-01
|
|
|-
|107.0.0.0/8
|[[ARIN]]
|2010-02
|
|
|-
|108.0.0.0/8
|[[ARIN]]
|2008-12
|
|
|-
|109.0.0.0/8
|[[RIPE NCC]]
|2009-01
|
|
|-
|110.0.0.0/8
|[[APNIC]]
|2008-11
|
|
|-
| 111.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
|112.0.0.0/8
|[[APNIC]]
|2008-05
|
|
|-
|113.0.0.0/8
|[[APNIC]]
|2008-05
|
|
|-
| 114.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
|115.0.0.0/8
|[[APNIC]]
|2007-10
|
|
|-
|116.0.0.0/8
|[[APNIC]]
|2007-01
|
|
|-
|117.0.0.0/8
|[[APNIC]]
|2007-01
|
|
|-
|118.0.0.0/8
|[[APNIC]]
|2007-01
|
|
|-
|119.0.0.0/8
|[[APNIC]]
|2007-01
|
|
|-
| 120.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
|121.0.0.0/8
|[[APNIC]]
|2006-01
|
|
|-
|122.0.0.0/8
|[[APNIC]]
|2006-01
|
|
|-
|123.0.0.0/8
|[[APNIC]]
|2006-01
|
|
|-
|124.0.0.0/8
|[[APNIC]]
|2005-01
|
|
|-
|125.0.0.0/8
|[[APNIC]]
|2005-01
|
|
|-
|126.0.0.0/8
|[[APNIC]]
|2005-01
|
|SOFTBANK Corp.
|-
| 128.0.0.0/8 || [[ARIN]] ||  1993-05
|  || Various registries (Maintained by ARIN). 128.0.0.0 is the start address of formerly "[[Classful network|Class B]]".
|-
|129.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|130.0.0.0/8
|
|
|
|Various registries
|-
|131.0.0.0/8
|
|
|
|Various registries
|-
|132.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|133.0.0.0/8
|[[APNIC]]
|1997-03
|
|[[Japan Network Information Center|JPNIC]]<ref>{{Cite web|title=133.0.0.0/8 Japan Network Information Center Prefix BGP Network Information - BGPView|url=https://bgpview.io/prefix/133.0.0.0/8|access-date=2022-01-25|website=bgpview.io}}</ref>
|-
|134.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|135.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|136.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|137.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|138.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|139.0.0.0/8
|MIX
|
|
|Various registries
|-
|140.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|141.0.0.0/8
|[[RIPE NCC]]
|1993-05
|
|Various registries (Maintained by RIPE NCC).
|-
|142.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|143.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|144.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|145.0.0.0/8
|[[RIPE NCC]]
|1993-05
|
|Various registries (Maintained by RIPE NCC).
|-
|146.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|147.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|148.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|149.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|150.0.0.0/8
|[[APNIC]]
|1993-05
|
|Various registries (Maintained by APNIC).
|-
|151.0.0.0/8
|[[RIPE NCC]]
|1993-05
|
|Various registries (Maintained by RIPE NCC).
|-
|152.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|153.0.0.0/8
|[[APNIC]]
|1993-05
|
|Various registries (Maintained by APNIC).
|-
|154.0.0.0/8
|[[AFRINIC]]
|1993-05
|
|Various registries (Maintained by AFRINIC).
|-
|155.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|156.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
|157.0.0.0/8
|[[ARIN]]
|1993-05
|
|Various registries (Maintained by ARIN).
|-
| 158.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 159.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 160.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 161.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 162.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 163.0.0.0/8
| [[APNIC]]
| 1993-05
|
| Various registries (Maintained by APNIC).
|-
| 164.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 165.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 166.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 167.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 168.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 169.0.0.0/8 || [[ARIN]] || 1993-05 || 1993-05-01 || Various registries (Maintained by ARIN). 169.254.0.0/16 (169.254.0.0–169.254.255.255) reserved for [[link-local address]]ing (RFC 6890).
|-
| 170.0.0.0/8
| [[ARIN]]
| 1993-05
|
| Various registries (Maintained by ARIN).
|-
| 171.0.0.0/8
| [[APNIC]]
| 1993-05
|
| Various registries (Maintained by APNIC).
|-
| 172.0.0.0/8 || [[ARIN]] || 1993-05 || 1993-05-01 || Various registries (Maintained by ARIN). 172.16.0.0/12 (172.16.0.0–172.31.255.255) reserved for [[private network]]s (RFC 1918).
|-
| 173.0.0.0/8
| [[ARIN]]
| 2008-02
|
|
|-
| 174.0.0.0/8
| [[ARIN]]
| 2008-02
|
|
|-
| 175.0.0.0/8
| [[APNIC]]
| 2009-08
|
|
|-
| 176.0.0.0/8
| [[RIPE NCC]]
| 2010-05
|
|
|-
| 177.0.0.0/8 || [[LACNIC]] || 2010-06 || ||
|-
| 178.0.0.0/8
| [[RIPE NCC]]
| 2009-01
|
| Various registries (Maintained by RIPE NCC).
|-
| 179.0.0.0/8 || [[LACNIC]] || 2011-02 || ||
|-
| 180.0.0.0/8
| [[APNIC]]
| 2009-04
|
|
|-
| 181.0.0.0/8 || [[LACNIC]] || 2010-06 || ||
|-
| 182.0.0.0/8
| [[APNIC]]
| 2009-08
|
|
|-
| 183.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
| 184.0.0.0/8
| [[ARIN]]
| 2008-12
|
|
|-
| 185.0.0.0/8
| [[RIPE NCC]]
| 2011-02
|
| Various registries (Maintained by RIPE NCC).
|-
| 186.0.0.0/8 || [[LACNIC]] || 2007-09 || ||
|-
| 187.0.0.0/8 || [[LACNIC]] || 2007-09 || ||
|-
| 188.0.0.0/8
| [[RIPE NCC]]
| 1993-05
|
| Various registries (Maintained by RIPE NCC).
|-
| 189.0.0.0/8 || [[LACNIC]] || 1995-06 || ||
|-
| 190.0.0.0/8 || [[LACNIC]] || 1995-06 || ||
|-
| 191.0.0.0/8 || [[LACNIC]] || 1993-05 || || Various registries (Maintained by LACNIC).
|-
| 192.0.0.0/8 || [[ARIN]] || 1993-05 || 1993-05-01 || Various registries (Maintained by ARIN). 192.0.2.0/24 reserved for TEST-NET-1 (RFC 5737). 192.88.99.0/24 reserved for 6to4 Relay Anycast (RFC 3068). 192.168.0.0/16 (192.168.0.0–192.168.255.255) reserved for [[private network]]s (RFC 1918). 192.0.0.0/24 reserved for IANA IPv4 Special Purpose Address Registry (RFC 5736). 192.0.0.0 is the start address of formerly "[[Classful network|Class C]]".
|-
| 193.0.0.0/8
| [[RIPE NCC]]
| 1993-05
|
|
|-
| 194.0.0.0/8
| [[RIPE NCC]]
| 1993-05
|
|
|-
| 195.0.0.0/8
| [[RIPE NCC]]
| 1993-05
|
|
|-
| 196.0.0.0/8
| [[AFRINIC]]
| 1993-05
|
| Various registries (Maintained by AFRINIC).
|-
| 197.0.0.0/8
| [[AFRINIC]]
| 2008-10
|
|
|-
| 198.0.0.0/8 || [[ARIN]] || 1993-05 ||  || Various registries (Maintained by ARIN). 198.18.0.0/15 reserved for Network Interconnect Device Benchmark Testing (RFC 6890). 198.51.100.0/24 reserved for TEST-NET-2 (RFC 5737).
|-
| 199.0.0.0/8
| [[ARIN]]
| 1993-05
|
|
|-
| 200.0.0.0/8 || [[LACNIC]] || 2002-11 || ||
|-
| 201.0.0.0/8 || [[LACNIC]] || 2003-04 || ||
|-
| 202.0.0.0/8 || [[APNIC]] || 2009-10 ||  || Various registries (Maintained by APNIC). 202.123.0.0/19 transferred to [[AfriNIC|AFRINIC]]
|-
| 203.0.0.0/8 || [[APNIC]] || 1993-05 ||  || 203.0.113.0/24 reserved for TEST-NET-3 (RFC 5737).
|-
| 204.0.0.0/8
| [[ARIN]]
| 1994-03
|
|
|-
| 205.0.0.0/8
| [[ARIN]]
| 1994-03
|
|
|-
| 206.0.0.0/8
| [[ARIN]]
| 1995-04
|
|
|-
| 207.0.0.0/8
| [[ARIN]]
| 1995-11
|
|
|-
| 208.0.0.0/8
| [[ARIN]]
| 1996-04
|
|
|-
| 209.0.0.0/8
| [[ARIN]]
| 1996-06
|
|
|-
| 210.0.0.0/8
| [[APNIC]]
| 1996-06
|
|
|-
| 211.0.0.0/8
| [[APNIC]]
| 1996-06
|
|
|-
| 212.0.0.0/8
| [[RIPE NCC]]
| 1997-10
|
|
|-
| 213.0.0.0/8
| [[RIPE NCC]]
| 1993-10
|
|
|-
| 216.0.0.0/8
| [[ARIN]]
| 1998-04
|
|
|-
| 217.0.0.0/8 || [[RIPE NCC]] || 2000-06 || 2002-06-25 || 
|-
| 218.0.0.0/8 || [[APNIC]] || 2010-01 ||  || Formerly IANA - Reserved 1981-09.
|-
| 219.0.0.0/8
| [[APNIC]]
| 2001-09
|
|
|-
| 220.0.0.0/8
| [[APNIC]]
| 2001-12
|
|
|-
| 221.0.0.0/8
| [[APNIC]]
| 2002-07
|
|
|-
| 222.0.0.0/8
| [[APNIC]]
| 2003-02
|
|
|-
| 223.0.0.0/8
| [[APNIC]]
| 2010-04
|
|
|}

Note that this list may not include current assignments of /8 blocks to all [[Regional Internet registry|regional]] or [[National Internet registry|national]] Internet registries.

==Original list of IPv4 assigned address blocks==
The original list of IPv4 address blocks was published in September 1981.{{Ref RFC|790}} In previous versions of the document,{{Ref RFC|776}}{{Ref RFC|750}} network numbers were [[8-bit]] numbers rather than the [[32-bit]] numbers used in IPv4.  At that time, three networks were added that were not listed earlier: 42.rrr.rrr.rrr, 43.rrr.rrr.rrr, and 44.rrr.rrr.rrr.

The relevant portion of RFC 790 is reproduced here with minor changes:

:* 000.rrr.rrr.rrr Reserved [JBP]
:* 001.rrr.rrr.rrr BBN-PR BBN Packet Radio Network [DCA2]
:* 002.rrr.rrr.rrr SF-PR-1 SF Packet Radio Network [JEM]
:* 003.rrr.rrr.rrr BBN-RCC BBN RCC Network [SGC]
:* 004.rrr.rrr.rrr [[SATNET]] Atlantic Satellite Network [DM11]
:* 005.rrr.rrr.rrr SILL-PR Ft. Sill Packet Radio Network[JEM]
:* 006.rrr.rrr.rrr SF-PR-2 SF Packet Radio Network [JEM]
:* 007.rrr.rrr.rrr CHAOS MIT CHAOS Network [MOON]
:* 008.rrr.rrr.rrr CLARKNET SATNET subnet for Clarksburg [DM11]
:* 009.rrr.rrr.rrr BRAGG-PR Ft. Bragg Packet Radio Net [JEM]
:* 010.rrr.rrr.rrr [[ARPANET]] ARPANET <nowiki>[</nowiki>[[Vint Cerf|VGC]]<nowiki>]</nowiki>
:* 011.rrr.rrr.rrr UCLNET University College London [PK]
:* 012.rrr.rrr.rrr CYCLADES CYCLADES <nowiki>[</nowiki>[[Vint Cerf|VGC]]<nowiki>]</nowiki>
:* 013.rrr.rrr.rrr Unassigned [JBP]
:* 014.rrr.rrr.rrr TELENET TELENET <nowiki>[</nowiki>[[Vint Cerf|VGC]]<nowiki>]</nowiki>
:* 015.rrr.rrr.rrr EPSS British Post Office EPSS [PK]
:* 016.rrr.rrr.rrr DATAPAC DATAPAC <nowiki>[</nowiki>[[Vint Cerf|VGC]]<nowiki>]</nowiki>
:* 017.rrr.rrr.rrr TRANSPAC TRANSPAC <nowiki>[</nowiki>[[Vint Cerf|VGC]]<nowiki>]</nowiki>
:* 018.rrr.rrr.rrr LCSNET MIT LCS Network [DDC2]
:* 019.rrr.rrr.rrr TYMNET TYMNET <nowiki>[</nowiki>[[Vint Cerf|VGC]]<nowiki>]</nowiki>
:* 020.rrr.rrr.rrr DC-PR D.C. Packet Radio Network <nowiki>[</nowiki>[[Vint Cerf|VGC]]<nowiki>]</nowiki>
:* 021.rrr.rrr.rrr EDN DCEC EDN [EC5]
:* 022.rrr.rrr.rrr DIALNET DIALNET [MRC]
:* 023.rrr.rrr.rrr MITRE MITRE Cablenet [APS]
:* 024.rrr.rrr.rrr BBN-LOCAL BBN Local Network [SGC]
:* 025.rrr.rrr.rrr RSRE-PPSN RSRE / PPSN [BD2]
:* 026.rrr.rrr.rrr AUTODIN-II AUTODIN II [EC5]
:* 027.rrr.rrr.rrr NOSC-LCCN NOSC / LCCN [KTP]
:* 028.rrr.rrr.rrr WIDEBAND Wide Band Satellite Network [CJW2]
:* 029.rrr.rrr.rrr DCN-COMSAT COMSAT Dist. Comp. Network [DLM1]
:* 030.rrr.rrr.rrr DCN-UCL UCL Dist. Comp. Network [PK]
:* 031.rrr.rrr.rrr BBN-SAT-TEST BBN SATNET Test Network [DM11]
:* 032.rrr.rrr.rrr UCL-CR1 UCL Cambridge Ring 1 [PK]
:* 033.rrr.rrr.rrr UCL-CR2 UCL Cambridge Ring 2 [PK]
:* 034.rrr.rrr.rrr MATNET Mobile Access Terminal Net [DM11]
:* 035.rrr.rrr.rrr NULL UCL/RSRE Null Network [BD2]
:* 036.rrr.rrr.rrr SU-NET Stanford University Ethernet [MRC]
:* 037.rrr.rrr.rrr DECNET Digital Equipment Network [DRL]
:* 038.rrr.rrr.rrr DECNET-TEST Test Digital Equipment Net [DRL]
:* 039.rrr.rrr.rrr SRINET SRI Local Network [GEOF]
:* 040.rrr.rrr.rrr CISLNET CISL Multics Network [CH2]
:* 041.rrr.rrr.rrr BBN-LN-TEST BBN Local Network Testbed [KTP]
:* 042.rrr.rrr.rrr S1NET LLL-S1-NET [EAK]
:* 043.rrr.rrr.rrr INTELPOST COMSAT INTELPOST [DLM1]
:* [[44.0.0.0/8|044.rrr.rrr.rrr]] [[AMPRNet|AMPRNET]] Amateur Radio Experiment Net <nowiki>[</nowiki>[[Hank Magnuski|HM]]<nowiki>]</nowiki>

==See also==
* [[Classless Inter-Domain Routing]] (CIDR)
* [[List of countries by IPv4 address allocation]]

==Notes==
{{reflist}}

==References==
* {{cite web|url=https://www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml|title=IANA IPv4 Address Space Registry|date=21 December 2017|publisher=[[Internet Assigned Numbers Authority]] (IANA)|access-date=22 December 2017}} The authoritative up-to-date list of IANA assignments.
* {{cite web |url=https://www.arin.net/ |title=ARIN Whois Database |publisher=[[American Registry for Internet Numbers]] (ARIN) |access-date=27 March 2011}}
* Historical IP address lists:
** {{cite web|url=http://www.isi.edu/in-notes/iana/assignments/ipv4-address-space |title=INTERNET PROTOCOL ADDRESS SPACE |archive-url=https://web.archive.org/web/20001018153247/http://www.isi.edu/in-notes/iana/assignments/ipv4-address-space |archive-date=18 October 2000 |date=October 2000 |publisher=[[Internet Assigned Numbers Authority]] (IANA) |access-date=27 March 2011 |url-status=dead }} First version of IANA table with historical notes via the [[Internet Archive]] [[Wayback Machine]].
** {{cite web|url=http://www.isi.edu/in-notes/iana/assignments/ipv4-address-space |title=Internet Protocol v4 Address Space |archive-url=https://web.archive.org/web/20071028235636/https://www.iana.org/assignments/ipv4-address-space |archive-date=28 October 2007 |date=September 2007 |publisher=[[Internet Assigned Numbers Authority]] (IANA) |access-date=27 March 2011 |url-status=dead }} Last version of IANA table with historical notes via the [[Internet Archive]] [[Wayback Machine]].
** {{cite web |url=http://www.aturtschi.com/whois/networks.html |title=Complete List of Class A and Class B Networks |last1= Turtschi |first1=Adrian |date= 13 September 1999 |publisher=Adrian Turtschi |access-date=27 March 2011}}
** {{cite web |url=http://flumps.org/ip/ |title=IP INDEX Encyclopedia |last1= Rogers |first1=Paul |date=November 1999 |publisher=flumps.org |archive-url=https://web.archive.org/web/20010414134649/http://www.flumps.org/ip/ |archive-date=14 April 2001 |access-date=27 March 2011}}
** {{cite web |url=http://www.infocellar.com/networks/ip/IP-addresses%20-complete-list.htm |title=IPv4 Addresses - the Complete Class A List |date=5 April 2003 |publisher=Infocellar |access-date=27 March 2011 |archive-url=https://web.archive.org/web/20110417061819/http://www.infocellar.com/networks/ip/IP-addresses%20-complete-list.htm |archive-date=17 April 2011 |url-status=dead }}
** {{cite web |url=http://www.donkboy.com/html/ipv4as.htm |title=INTERNET PROTOCOL V4 ADDRESS SPACE |date=30 June 2005 |publisher=DonkBoy Internet |access-date=27 March 2011}}
** {{cite web |url=http://www.cromwell-intl.com/tcpip/class-a-nets.html |title=The /8 or Class A Networks |last1=Cromwell |first1=Bob |date=13 November 2008 |publisher=Bob Cromwell |access-date=27 March 2011 |archive-url=https://web.archive.org/web/20101217125758/http://cromwell-intl.com/tcpip/class-a-nets.html |archive-date=17 December 2010 |url-status=dead }}
* {{cite web |url=https://www.potaroo.net/drafts/draft-huston-ipv4-iana-registry-01.html |title=Report on the IANA IPv4 Address Registry |last1=Huston |first1=Geoff |date= 29 August 2005 |publisher=[[Internet Society|The Internet Society]] |access-date=27 March 2011}}
* {{cite web |url=https://www.cidr-report.org/images/iana-v4.html |title=IANA IPv4 Address Registry - Current Issues |last1=Huston |first1=Geoff |date=July 2003 |publisher=CIDR Report |access-date=27 March 2011}}
* {{cite web |url=https://www.icann.org/resources/pages/remaining-ipv4-2012-02-25-en |title=Global Policy for the Allocation of the Remaining IPv4 Address Space |date=6 March 2009 |publisher=[[Internet Corporation for Assigned Names and Numbers]] (ICANN) |access-date=27 March 2011}}
{{Use dmy dates|date=January 2019}}

{{DEFAULTSORT:List of assigned 8 IPv4 address blocks}}
[[Category:Network addressing]]
[[Category:IPv4]]
[[Category:Internet-related lists|IPv4 address blocks]]