.ARPA Zone Management

The .arpa domain is the “Address and Routing Parameter Area” domain and is designated to be used exclusively for Internet-infrastructure purposes. It is administered by the IANA in cooperation with the Internet technical community under the guidance of the Internet Architecture Board. For the management guidelines and operational requirements of the .arpa domain, see RFC 3172. The .arpa domain currently includes the following second-level domains:

Domain / UsageNormative Reference
ARPA
Reserved exclusively to support operationally-critical infrastructural identifier spaces as advised by the Internet Architecture Board
RFC 3172
E164.ARPA
For mapping E.164 numbers to Internet URIs
RFC 3761
IN-ADDR.ARPA
For mapping IPv4 addresses to Internet domain names
RFC 1035
IP6.ARPA
For mapping IPv6 addresses to Internet domain names
RFC 3152
IRIS.ARPA
For locating Internet Registry Information Services
RFC 4698
URI.ARPA
For resolving Uniform Resource Identifiers according to the Dynamic Delegation Discovery System
RFC 3405
URN.ARPA
For resolving Uniform Resource Names according to the Dynamic Delegation Discovery System
RFC 3405

Maintain

Changes to the .arpa zone must be coordinated manually with IANA. You can contact IANA at iana@iana.org.