Special-use domain name
Set of reserved Internet domain names
From Wikipedia, the free encyclopedia
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).[1]
Reserved domain names
The following list comprises the domain names list by IANA in the category of special-use domain names.[2]
| Domain | Purpose | Authority document |
|---|---|---|
| .alt | Preventing name collisions with DNS | RFC 9476[3] |
| 6tisch.arpa | IETF 6TiSCH working group | RFC 9031[4] |
| 10.in-addr.arpa | Reverse mapping for (RFC 1918[5]) IPv4 private internets | RFC 6761[1] |
| 16.172.in-addr.arpa | ||
| 17.172.in-addr.arpa | ||
| 18.172.in-addr.arpa | ||
| 19.172.in-addr.arpa | ||
| 20.172.in-addr.arpa | ||
| 21.172.in-addr.arpa | ||
| 22.172.in-addr.arpa | ||
| 23.172.in-addr.arpa | ||
| 24.172.in-addr.arpa | ||
| 25.172.in-addr.arpa | ||
| 26.172.in-addr.arpa | ||
| 27.172.in-addr.arpa | ||
| 28.172.in-addr.arpa | ||
| 29.172.in-addr.arpa | ||
| 30.172.in-addr.arpa | ||
| 31.172.in-addr.arpa | ||
| 168.192.in-addr.arpa | ||
| 170.0.0.192.in-addr.arpa | NAT64 prefix discovery[6] | RFC 8880[7] |
| 171.0.0.192.in-addr.arpa | ||
| ipv4only.arpa | ||
| 254.169.in-addr.arpa | Reverse zone for the (RFC 3927[8]) IPv4 link-local address space | RFC 6303[9] |
| 8.e.f.ip6.arpa | Reverse zones for the (RFC 4291[10]) IPv6 link-local address space | |
| 9.e.f.ip6.arpa | ||
| a.e.f.ip6.arpa | ||
| b.e.f.ip6.arpa | ||
| .home.arpa | Non-unique use in residential networks | RFC 8375[11] |
| .example | Documentation, tutorials | RFC 6761[1] |
| example.com | ||
| example.net | ||
| example.org | ||
| .invalid | Expected to always be invalid[12] | RFC 6761[1] |
| .local | Used in multicast DNS (mDNS) | RFC 6762[13]: §3 |
| .localhost | Refers to the loopback addresses (:: and 127.0.0.1) | RFC 6761[1] |
| .onion | Anonymous onion service | RFC 7686[14] |
| .test | Network testing | RFC 6761[1] |
See also
- .internal, reserved by ICANN
- Reserved top-level domains