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A top-level domain (TLD) is the last part of an Internet domain name; that is, the letters which follow the final 'dot' of any URL. For example, in the domain name wikipedia.org, the top-level domain is org (or ORG, as domain names are not case-sensitive). The Internet Assigned Numbers Authority (IANA) currently classifies top-level domains into three types:
A full list of currently existing TLDs can be found at the list of Internet top-level domains.
Historical TLDsA nato was added in the late 1980s by the NIC for the use of NATO, who felt that none of the then existing TLDs adequately reflected their status as an international organization. Soon after this addition, however, the NIC created the int TLD for the use of international organizations, and convinced NATO to use nato.int instead. However, the nato TLD, although no longer used, was not deleted until July 1996. Other historical TLDs are dd for the German Democratic Republic (East Germany), cs for Czechoslovakia and zr for Zaire. Pseudo-domainsIn the past the Internet was just one of many wide-area computer networks. Computers not connected to the Internet, but connected to another network such as Bitnet, CSNET or UUCP, could generally exchange e-mail with the Internet via e-mail gateways. When used on the Internet, addresses on these networks were often placed under pseudo-domains such as bitnet, csnet and uucp; however these pseudo-domains were not real top-level domains and did not exist in DNS. Most of these networks have long since ceased to exist, and although UUCP still gets significant use in parts of the world where Internet infrastructure has not yet become well-established, it subsequently transitioned to using Internet domain names, so pseudo-domains now largely survive as historical relics. The anonymity network Tor has a pseudo-domain onion, which can only be reached with a Tor client because it uses the Tor-protocol (Onion Routing) to reach the hidden service in order to protect the anonymity of the domain. Reserved TLDsRFC 2606 reserves the following four top-level domain names for various purposes, with the intention that these should never become actual TLDs in the global DNS:
TLDs in alternative rootsAlternative DNS roots have their own sets of TLDs. See that article for details. At times, browser plugins have been developed to allow access to some set of "alternative" domain names even when the normal DNS roots are otherwise used. See also
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