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'''.arpa''' stands for '''Address and Routing Parameter Area.''' It is one of the original top level domain names ([[TLD]]s) delegated in the root zone of the Domain Name System ([[DNS]]) of the internet. It is classified as infrastructure top-level domain name and it is exclusively used to support operationally-critical infrastructural identifier spaces. The Internet Architecture Board ([[IAB]]) and Internet Corporation for Assigned Names and Numbers ([[ICANN]]) collaborate in managing the .arpa TLD. The Internet Assigned Numbers Authority ([[IANA]]) is in-charge in the operational administration of the TLD with the cooperation of the technical community. Technical guidelines are provided by IAB.<ref>[http://tools.ietf.org/html/rfc3172 RFC 3172]</ref> <ref>[http://www.iana.org/domains/arpa .ARPA Zone Database Management]</ref>

'''.arpa''' stands for '''Address and Routing Parameter Area.''' It is one of the original top level domain names ([[TLD]]s) delegated in the [[Root Zone|root zone]] of the Domain Name System ([[DNS]]) of the internet. It is classified as infrastructure top-level domain name and it is exclusively used to support operationally-critical infrastructural identifier spaces. The Internet Architecture Board ([[IAB]]) and Internet Corporation for Assigned Names and Numbers ([[ICANN]]) collaborate in managing the .arpa TLD. The Internet Assigned Numbers Authority ([[IANA]]) is in-charge in the operational administration of the TLD with the cooperation of the technical community. Technical guidelines are provided by 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 that will serve as a transition mechanism for a set of host names in the [[ARPANET]] that were administered by [[DARPA]]. The host names will be phased out after a replacement domain name has been 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 is to purge everything after the transition, the sub-domain in-addr.arpa remained active and it has been utilized for reverse DNS query of Internet Protocol addresses. <ref>[http://tools.ietf.org/html/rfc3172#appendix-A RFC 3172]</ref>

Originally, .arpa was established as a temporary domain that will serve as a transition mechanism for a set of host names in the [[ARPANET]] that were administered by [[DARPA]]. The host names will be phased out after a replacement domain name has been 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 is to purge everything after the transition, the sub-domain in-addr.arpa remained active and it has been utilized for reverse DNS query of Internet Protocol addresses. <ref>[http://tools.ietf.org/html/rfc3172#appendix-A RFC 3172]</ref>