This list of Internet top-level domain extensions contains all top-level domains, which are those domains in the DNS root zone of the Domain Name System of the Internet.
The official list is at The official list of all top-level domains is maintained by the Internet Assigned Numbers Authority (IANA).
This is an open TLD; any person or entity is permitted to register.
Domain name registrations may be successfully challenged if the holder cannot prove an outside relation justifying reservation of the name This is an open TLD; any person or entity is permitted to register.
Originally intended for use by domains pointing to a distributed network of computers, or "umbrella" sites that act as the portal to a set of smaller websites.
The TLD is limited to specific higher educational institutions such as, but not limited to, trade schools and universities. S., its use was restricted in 2001 to post-secondary institutions accredited by an agency on the list of nationally recognized accrediting agencies.
This domain is therefore almost exclusively used by American colleges and universities.
Some institutions, such as the Exploratorium, that do not meet the current registration criteria have grandfathered domain names.
Commonly used for academic websites, such as universities.
However, is not to be confused with the official British academic domain uk or the official Indian academic domain in.
Also used in the accounting, consulting, and air-conditioning industries.
Defined by the Antarctic Treaty as everything south of latitude 60°S.
AQ domain names are available to government organizations who are signatories to the Antarctic Treaty and to other registrants who have a physical presence in Antarctica.
Australian territory: not to be confused with Cocos islands in Guam.