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.

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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.

Domain name registrations may be successfully challenged if the holder cannot prove an outside relation justifying reservation of the name, to prevent "squatting".

It was originally administered by the United States Department of Defense.

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 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.

Though originally intended for use by for-profit business entities, for a number of reasons it became the "main" TLD for domain names and is currently used by all types of entities including nonprofits, schools, and private individuals.