Editing .arpa (section)

==History==
The [[ARPANET]], named for the [[Advanced Research Projects Agency]] (ARPA), was launched in 1969, and is considered the earliest predecessor of the [[Internet]]. The agency's name was adopted as the name for the first formal name space of the network after it had transitioned to [[TCP/IP]] networking in January 1983.{{Ref RFC|881}} The name was used as a naming suffix for all then-existing ARPANET hosts. Hierarchical domain-style names were intended to support delegation of responsibility and authority for adding future hosts to the network.

With the formal development of such a hierarchical naming system, the domain also became one of the inaugural members of a set of domain names for specific types of network members, namely [[.com|com]] for commercial users, [[.org|org]] for organizations, [[.edu|edu]] for educational institutions, [[.gov|gov]] for government entities, and [[.mil|mil]] for networks of the United States military.{{Ref RFC|920}}

It was expected that the use of ''arpa'' would be temporary and that the existing systems would be migrated to other domains.<ref name=rfc920/> But ''arpa'' also provided e-mail addresses associated with the Network Information Center, which administered the naming system. After serving the transitional purpose, it proved impractical to remove the domain. The domain ''in-addr.arpa'' had been installed for [[reverse DNS lookup]] of IP addresses.{{Ref RFC|1035|rsection=3.5}}

Originally, the IETF intended that new infrastructure databases would be created in the top-level domain [[.int|''int'']]. In May 2000, this policy was reversed and it was decided that the top-level domain ''int'' should be restricted to use by international organizations.<ref name="IAB Statement2">{{cite web|url=https://www.iab.org/documents/docs/iab-arpa-stmt.txt|title=IAB Statement on Infrastructure Domain and Subdomains|access-date=2019-08-01|archive-date=2003-08-27|archive-url=https://web.archive.org/web/20030827065632/https://www.iab.org/documents/docs/iab-arpa-stmt.txt|df=dmy-all}}</ref>  ''Arpa'' was retained for its long-standing purpose, but its full name was changed to the ''Address and Routing Parameter Area'', making the zone name a [[backronym]].{{Ref RFC|3172|rp=7|quote=Further, as indicated by DARPA, the arpa TLD string should be given a different expansion such as "Address and Routing Parameter Area" to avoid any implication that DARPA has operational responsibility for the domain.}} Registrations of internet infrastructure services in [[.int]] made prior to this policy change, were optionally grandfathered in and not required to move to .arpa.

In March 2010, zone arpa was secured with digital signatures within the [[Domain Name System Security Extensions]] (DNSSEC).<ref>{{Cite web | url=http://dnssec-deployment.org/pipermail/dnssec-deployment/2010-March/003730.html | archive-url=https://web.archive.org/web/20100328000016/http://dnssec-deployment.org/pipermail/dnssec-deployment/2010-March/003730.html | url-status=dead | archive-date=2010-03-28 | title=[Dnssec-deployment] Signing of the ARPA zone}}</ref>