View source for .localhost

{{short description|Domain name label that may not be installed as a top-level domain}}
{{About||information about how software uses this Special-Use Domain Name|localhost}}
{{Infobox Top level domain
|name=localhost
|introduced=1999
|type=[[Top-level domain#Reserved domains|Reserved top-level domain]]
|intendeduse=identifies the local computer
|document={{IETF RFC|2606}}
|}}

The name '''localhost''' is reserved by the [[Internet Engineering Task Force]] (IETF) as a domain name label that may not be installed as a [[top-level domain]] in the [[Domain Name System]] (DNS) of the [[Internet]].{{Ref RFC|2606}}{{Ref RFC|6761}}

==Reserved DNS names==
In 1999, the [[Internet Engineering Task Force]] reserved the DNS labels {{mono|localhost}}, {{mono|[[.example|example]]}}, {{mono|[[.invalid|invalid]]}}, and {{mono|[[.test|test]]}} so that they may not be installed into the [[DNS root zone|root zone]] of the Domain Name System.

The reasons for reservation of these top-level domain names is to reduce the likelihood of conflict and confusion.{{Ref RFC|2606}}{{Ref RFC|6761}} This allows the use of these names for either documentation purposes or in local testing scenarios.

==Conventional use==
The name [[localhost]] is a commonly defined hostname for the [[loopback]] interface in most [[TCP/IP]] systems, resolving to the [[IP address]]es {{IPaddr|127.0.0.1}} in [[IPv4]] and {{IPaddr|::1}} for [[IPv6]]. As a top-level domain, the name has traditionally been defined statically in host DNS implementations with address records (A and AAAA) pointing to the same loopback addresses.  Any other use conflicts with widely deployed algorithms relying on this convention.

==References==
{{reflist}}

{{GTLD}}

{{DEFAULTSORT:Localhost}}
[[Category:Top-level domains]]
[[Category:Internet properties established in 1999]]

[[sv:Toppdomän#Generiska toppdomäner]]