.arpa Domain Delegation
.arpa is a infrastructure top-level domain (gTLD) managed by Internet Architecture Board (IAB). The URL for .arpa domain registration services is http://www.iana.org/arpa-dom/, and the responsible WHOIS server is whois.iana.org.
A top-level domain (TLD) is an internet domain name extension that is operated by the Internet Assigned Numbers Authority (IANA). One type of TLDs are generic top-level domains (gTLDs) which consist of 3 or more characters. A special type of generic TLDs are infrastructure TLDs like .arpa that are operated by IANA and provide operationally-critical infrastructural identifier spaces.
.arpa Authoritative Information
|Type||Infrastructure Top-Level Domain (gTLD)|
|Sponsoring Organisation||Internet Architecture Board (IAB)|
Further information about the .arpa root zone can be found at IANA. Click here for a full list of top-level domains.