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{{TLD|
{{TLD|
|logo =
|logo =
|manager = IANA
|manager = [[IANA]]
|country =
|country =
|stringcontention = none
|stringcontention =
|registryprovider = .ARPA Registry
|registryprovider = [[.ARPA Registry]]
|date = 1985
|date = 1985
|type = TLD
|type = TLD
|community = Internet-infrastructure purposes only
|community = for Internet-infrastructure purposes only
|keypeople =
|keypeople =
}}
}}
'''.arpa''' stands for '''Address and Routing Parameter Area.''' It is one of the original [[TLD|top level domain names]] (TLDs) delegated in the [[Root Zone|root zone]] of the [[DNS|Domain Name System]] (DNS) of the Internet. It is classified as an infrastructure top-level domain name and it is exclusively used to support operationally-critical infrastructural identifier spaces. The [[IAB|Internet Architecture Board]] (IAB) and [[ICANN]] jointly manage the .arpa TLD. The [[IANA|Internet Assigned Numbers Authority]] (IANA) is in-charge of the operational administration of the TLD with the cooperation of the technical community. Technical guidelines are provided by the IAB.<ref>[http://tools.ietf.org/html/rfc3172 RFC 3172]</ref> <ref>[http://www.iana.org/domains/arpa .ARPA Zone Database Management]</ref>
Originally, .arpa was established as a temporary domain to serve as a transition mechanism for a set of host names in the [[ARPANET]] that were administered by [[DARPA]]. The host names were to be phased out after a replacement was created under the categorized TLDs which include [[.com]], [[.edu]], [[.mil]], [[.net]], [[.gov]] and [[.org]].<ref>[http://tools.ietf.org/rfc/rfc920.txt RFC 920]</ref> Although the initial plan for .arpa was to purge everything after the transition, the sub-domain in-addr.arpa remained active and it has been utilized for reverse [[DNS]] queries of [[IP Address|Internet Protocol addresses]].<ref>[http://tools.ietf.org/html/rfc3172#appendix-A RFC 3172]</ref>
In 2000, the IAB informed the technical community that .arpa had been re-designated as an Address and Routing Parameter Area. .arpa is to serve as a domain space where all new infrastructure sub-domains will be placed to maintain the stability of the internet. The IAB also recommended to the [[IESG|Internet Engineering Steering Group]] (IESG) that no new infrastructure domains were to be added to [[.int]], that protocols requiring specific domain roots should be rooted elsewhere, and that new infrastructure domains from the [[IETF|Internet Engineering Task Force]] (IETF) protocols must be allocated to the .arpa TLD. Management is to be handled by IANA. In addition. the IAB also suggested the review of all existing IETF infrastructures allocated under .int, and if the costs of transferring them is greater than the risk of staying in place. <ref>[http://www.iab.org/documents/correspondence-reports-documents/docs2000/iab-statement-on-infrastructure-domain-and-subdomains-may-2000/ IAB Statement on Infrastructure Domain and Subdomains, May 2000]</ref>
==Uses for .arpa==
IANA has allowed the following sub-domains on .arpa:<ref>
[http://www.iana.org/domains/arpa ARPA Zone Management]</ref>
* E164.ARPA - mapping E.164 numbers to Internet URIs
* IN-ADDR-SERVERS.ARPA- hosting authoritative name servers for the in-addr.arpa domain
* IN-ADDR.ARPA- mapping [[IPv4]] addresses to Internet domain names
* IP6-SERVERS.ARPA- hosting authoritative name servers for the ip6.arpa domain
* IP6.ARPA- mapping IPv6 addresses to Internet domain names
* IRIS.ARPA- locating Internet Registry Information Services
* URI.ARPA- resolving [[URI|Uniform Resource Identifiers]] (URI) according to the Dynamic Delegation Discovery System
* URN.ARPA- resolving [[URN|Uniform Resource Names]] (URN) according to the Dynamic Delegation Discovery System
==References==
{{reflist}}
[[Category:TLD]]