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The domain name gov is a sponsored top-level domain (sTLD) in the Domain Name System of the Internet. The name is derived from ''government'', indicating its restricted use by government entities in the United States. The ''gov'' domain is administered by the General Services Administration (GSA), an independent agency of the United States federal government. The U.S. is the only country that has a government-specific top-level domain in addition to its country-code top-level domain. This is a result of the origins of the Internet as a U.S. federal government-sponsored research network (see ARPANET and National Science Foundation Network). Other countries typically delegate a second-level domain for this purpose, for example: .gc.ca is the second-level domain for the Government of Canada and all subdomains. Some U.S. federal agencies use ''fed.us'' rather than ''gov''. The Department of Defense and its subsidiary organizations use the ''mil'' sTLD. Some U.S. governmental entities use other domains, such as ''com'' domains by the United States Postal Service (which uses both ''usps.gov'' and ''usps.com'' for the same website, although it only advertises the ''com'' address), and the United States Army's recruitment website (''goarmy.com'', this trend is repeated at the recruitment websites of the other branches of the U.S. military). All governments in the U.S. were allowed to apply for delegations in ''gov'' before May 2012,〔(【引用サイトリンク】title=Welcome - DOTGOV )〕 such as atlantaga.gov for the city of Atlanta, loudoun.gov for the county of Loudoun, Virginia and georgia.gov for the U.S. state of Georgia. This was not always true; under an earlier policy, only federal agencies were allowed to use the domain, and agencies beneath cabinet level were required to use subdomains of their parent agency. There is a lack of consistency in addresses of state and local government sites, with some using ''gov'', some ''us'', some using both (the Commonwealth of Pennsylvania uses ''www.pa.gov'', ''www.pennsylvania.gov'' and ''www.state.pa.us'' for the same web site) and still others in ''com'', ''org'' or other TLDs. ==Availability== Use of the domain ''gov'' is restricted to government entities. According to GSA guidelines, this includes U.S. governmental departments, programs, and agencies on the federal level; federally recognized tribes, referred to by the GSA as Native Sovereign Nations, which must use the suffix -NSN.gov; State governmental entities and programs; cities and townships represented by an elected body of officials; counties and parishes represented by an elected body of officials; and U.S. territories.〔(【引用サイトリンク】 title=Eligibility Requirements )〕 The URL for registration services is www.dotgov.gov. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「.gov」の詳細全文を読む スポンサード リンク
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