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]

DomainPurposeAuthority document
alt.preventing name collisions with DNSRFC 9476
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.
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 networksRFC 8375
example.documentation, tutorials, etc.RFC 6761
example.com.use in documentation, tutorials, testingRFC 6761
example.net.
example.org.
invalid.Avoidance of confusion and errors per RFC 2606RFC 6761
intranet.Used for Private/internal DNS NamespacesRFC 6762 (Appendix G)
internal.
private.
corp.
home.
lan.
local.Used for Multicast DNSRFC 6762 (Section 3)
localhost.Reserved to avoidance of confusion and errorsRFC 6761
onion.Anonymous onion serviceRFC 7686
test.Avoidance of confusion, allowing use for documentation and network testingRFC 6761

See also

References

  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.
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