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Introduced 1999
TLD type Reserved top-level domain
Status Reserved to prevent conflict and confusion
Intended use In documentation or for internal testing
Structure Those using it for testing can use it in any desired structure
Documents RFC 2606

The name test is reserved by the Internet Engineering Task Force (IETF) in RFC 2606 (June 1999) as a domain name that is not intended to be installed as a top-level domain (TLD) in the global Domain Name System (DNS) of the Internet for production use.[1]

Reserved DNS names[edit]

In 1999, the Internet Engineering Task Force reserved the DNS labels example, invalid, localhost, and test so that they may not be installed into the root zone of the Domain Name System.

The reason for reservation of these top-level domain names is to reduce the likelihood of conflict and confusion,[1] this allows the use of these names for either documentation purposes or in local testing scenarios.


IANA distinguishes the following groups of top-level domains:[2]


  1. ^ a b RFC 2606 (BCP 32), Reserved Top Level DNS Names, D. Eastlake, A. Panitz, The Internet Society (June 1999)
  2. ^ "IANA root zone database". Iana.org. Retrieved 2015-11-10.