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Special-use domain name

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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

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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
6tisch.arpa. IETF 6TiSH working group RFC 9031
10.in-addr.arpa. private network reverse mapping RFC 6761
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 (RFC 7050) RFC 8880
171.0.0.192.in-addr.arpa.
ipv4only.arpa.
254.169.in-addr.arpa. Use in multicast DNS (mDNS) RFC 6762
8.e.f.ip6.arpa.
9.e.f.ip6.arpa.
a.e.f.ip6.arpa.
b.e.f.ip6.arpa.
home.arpa. Non-unique use on residential networks RFC 8375
example. documentation, tutorials, etc. RFC 6761
example.com. use in documentation, tutorials, testing RFC 6761
example.net.
example.org.
invalid. Avoidance of confusion and errors per RFC 2606 RFC 6761
local. Used for Multicast DNS RFC 6762 (Section 3)
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

See also

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References

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  1. ^ RFC 6761, S. Chesire, M. Krochmal, Special-Use Domain Names, IETF (February 2013)
  2. ^ "Special-Use Domain Names". Internet Assigned Number Authority. Retrieved 2020-06-16.