.arpa
| Manager: | IANA |
| Registry Provider: | .ARPA Registry |
| Date Implemented: | 1985 |
| Type: | TLD |
| Community: | Internet-infrastructure purposes only |
More information: 
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.arpa stands for Address and Routing Parameter Area. It is one of the original top level domain names (TLDs) 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.[1] [2]
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.[3]