A special-use domain name is a domain name that is defined and reserved in the hierarchy of the Domain Name System of the Internet for special purposes. The designation of a reserved special-use domain is authorized by the Internet Engineering Task Force (IETF) and executed, maintained, and published by the Internet Assigned Numbers Authority (IANA).
Reserved domain names The following list comprises the domain names list by IANA in the category of special-use domain names.
Domain Purpose Authority document .alt Preventing name collisions with DNS 6tisch.arpa IETF 6TiSCH working group 10.in-addr.arpa Reverse zones for IPv4 private networks (see AS112) 16.172.in-addr.arpa17.172.in-addr.arpa18.172.in-addr.arpa19.172.in-addr.arpa20.172.in-addr.arpa21.172.in-addr.arpa22.172.in-addr.arpa23.172.in-addr.arpa24.172.in-addr.arpa25.172.in-addr.arpa26.172.in-addr.arpa27.172.in-addr.arpa28.172.in-addr.arpa29.172.in-addr.arpa30.172.in-addr.arpa31.172.in-addr.arpa168.192.in-addr.arpa170.0.0.192.in-addr.arpa NAT64 prefix discovery 171.0.0.192.in-addr.arpaipv4only.arpa254.169.in-addr.arpa Reverse zone for the IPv4 link-local address space 8.e.f.ip6.arpa Reverse zones for the IPv6 link-local address space9.e.f.ip6.arpaa.e.f.ip6.arpab.e.f.ip6.arpa.eap.arpa Extensible Authentication Protocol .eap-noob.arpa.home.arpa Non-unique use in residential networks .resolver.arpa Facilitate upgrading to encrypted DNS .service.arpa DNS-based service discovery .example Documentation, tutorials, or testing example.comexample.netexample.org.invalid.test.local Used in multicast DNS (mDNS) .localhost Refers to the loopback addresses ( and ) .onion Tor network onion services
See also
.internal, reserved by ICANN Reserved top-level domains
References