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 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 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 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. |