Special-use domain name


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 and executed, maintained, and published by the Internet Assigned Numbers Authority.

Reserved domain names

The following list comprises the domain names list by IANA in the category of special-use domain names.
DomainPurposeAuthority document
6tisch.arpa.IETF 6TiSH working groupIETF draft-ietf-6tisch-minimal-security-15
10.in-addr.arpa.private network reverse mappingRFC 6761
16.172.in-addr.arpa.private network reverse mappingRFC 6761
17.172.in-addr.arpa.private network reverse mappingRFC 6761
18.172.in-addr.arpa.private network reverse mappingRFC 6761
19.172.in-addr.arpa.private network reverse mappingRFC 6761
20.172.in-addr.arpa.private network reverse mappingRFC 6761
21.172.in-addr.arpa.private network reverse mappingRFC 6761
22.172.in-addr.arpa.private network reverse mappingRFC 6761
23.172.in-addr.arpa.private network reverse mappingRFC 6761
24.172.in-addr.arpa.private network reverse mappingRFC 6761
25.172.in-addr.arpa.private network reverse mappingRFC 6761
26.172.in-addr.arpa.private network reverse mappingRFC 6761
27.172.in-addr.arpa.private network reverse mappingRFC 6761
28.172.in-addr.arpa.private network reverse mappingRFC 6761
29.172.in-addr.arpa.private network reverse mappingRFC 6761
30.172.in-addr.arpa.private network reverse mappingRFC 6761
31.172.in-addr.arpa.private network reverse mappingRFC 6761
168.192.in-addr.arpa.private network reverse mappingRFC 6761
170.0.0.192.in-addr.arpa.NAT64 prefix discovery IETF draft-cheshire-sudn-ipv4only-dot-arpa
171.0.0.192.in-addr.arpa.NAT64 prefix discovery IETF draft-cheshire-sudn-ipv4only-dot-arpa
ipv4only.arpa.NAT64 prefix discovery IETF draft-cheshire-sudn-ipv4only-dot-arpa
254.169.in-addr.arpa.Use in multicast DNS RFC 6762
8.e.f.ip6.arpa.Use in multicast DNS RFC 6762
9.e.f.ip6.arpa.Use in multicast DNS RFC 6762
a.e.f.ip6.arpa.Use in multicast DNS RFC 6762
b.e.f.ip6.arpa.Use in multicast DNS RFC 6762
home.arpa.Non-unique use on residential networksRFC 8375
example.documentation, tutorials, etc. RFC 6761
example.com.use in documentation, tutorials, testingRFC 6761
example.net.use in documentation, tutorials, testingRFC 6761
example.org.use in documentation, tutorials, testingRFC 6761
invalid.Avoidance of confusion and errors per RFC 2606RFC 6761
local.Pseudo-top-level domain without specific purpose or meaning, typical use is zero-configuration networking RFC 6762
localhost.Reserved to avoidance of confusion and errors RFC 6761
onion.Anonymous onion service RFC 7686
test.Avoidance of confusion, allowing use for documentation and network testing RFC 6761