By convention, the following domains are reserved within each TLD for special purposes - they should not be made available for public registration.

|=|Domain|=|Description|=|
|| example.TLD || Per the guidance in [[https://tools.ietf.org/html/rfc6761 | RFC 6761]], this domain name should be reserved for use in documentation. The domain should resolve to an actual site, either the default registration site, or a special purpose site. ||
|| localhost.TLD || Per the guidance in [[https://tools.ietf.org/html/rfc6761 | RFC 6761]], this domain name should be reserved for use in documentation. The domain should resolve to an actual site, either the default registration site, or a special purpose site. ||
|| opennic.TLD || This domain should resolve to the default registration site. Additionally, the email address hostmaster@opennic.TLD should be valid and should reach the administrator of the TLD. ||
|| reg.TLD || This domain should resolve to the default registration site. ||
|| register.TLD || This domain should resolve to the default registration site. ||
|| test.TLD || Per the guidance in [[https://tools.ietf.org/html/rfc6761 | RFC 6761]], this domain name should be reserved for use in documentation. The domain should resolve to an actual site, either the default registration site, or a special purpose site. ||
|| www.TLD || This domain should resolve to the default registration site. ||