.ARPA Domain Domains Protocols Numbers About .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. We administer the domain in cooperation with the Internet technical community through 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 Usage / Reference 6tisch.arpa For IPv6 over the Time-Slotted Channel Hopping mode of IEEE 802.15.4 RFC 9031 arpa Reserved exclusively to support operationally-critical infrastructural identifier spaces as advised by the Internet Architecture Board RFC 3172 as112.arpa For sinking DNS traffic for reverse IP address lookups and other applications RFC 7535 e164.arpa For mapping E.164 numbers to Internet URIs RFC 6116 eap-noob.arpa Deprecated For the Nimble Out-Of-Band authentication method of the Extensible Authentication Protocol framework RFC 9140 RFC 9965 eap.arpa For provisioning within the Extensible Authentication Protocol framework RFC 9965 home.arpa For non-unique use in residential home networks RFC 8375 in-addr-servers.arpa For hosting authoritative name servers for the in-addr.arpa domain RFC 5855 in-addr.arpa For mapping IPv4 addresses to Internet domain names RFC 1035 ip6-servers.arpa For hosting authoritative name servers for the ip6.arpa domain RFC 5855 ip6.arpa For mapping IPv6 addresses to Internet domain names RFC 3152 ipv4only.arpa For detecting the presence of DNS64 and for learning the IPv6 prefix used for protocol translation RFC 7050 iris.arpa For locating Internet Registry Information Services RFC 4698 ns.arpa For hosting authoritative name servers for the .arpa domain RFC 9120 resolver.arpa For discovery of designated DNS resolvers RFC 9462 service.arpa For DNS-based service discovery over unicast RFC 9665 uri.arpa For resolving Uniform Resource Identifiers according to the Dynamic Delegation Discovery System RFC 3405 RFC 8958 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 us. Domain Names Overview Root Zone Management Overview Top-Level Domains Files and Downloads Manage Delegations Instructions & Guides .INT Registry Overview Register/modify an .INT domain Eligibility .ARPA Registry IDN Practices Repository Overview Submit a table Root Key Signing Key (DNSSEC) Overview Trust Anchors and Rollovers Key Signing Ceremonies Policies & Procedures Community Representatives Reserved Domains Domain Names Root Zone Registry .INT Registry .ARPA Registry IDN Repository Number Resources Number Registries RIR Allocation Data Abuse Information Protocols Protocol Registries Time Zone Database About Us News Performance The Organization Archive Contact Us The IANA functions coordinate the Internet’s globally unique identifiers, and are provided by Public Technical Identifiers, an affiliate of ICANN. Privacy Policy Terms of Service