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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 a top-level domain (TLD) that is intended for use in the testing of software. The name was reserved by the Internet Engineering Task Force (IETF) in RFC 2606 (June 1999) and is not intended to ever be installed into the global Domain Name System (DNS) of the Internet.[1] Because neither test nor any of its subdomains can be registered, they can be used for testing purposes without fear of conflicts with current or future domain names.

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.