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A domain name registrar is an organization or commercial entity that manages the reservation of Internet domain names. A domain name registrar must be accredited by a generic top-level domain (gTLD) registry and/or a country code top-level domain (ccTLD) registry. The management is done in accordance with the guidelines of the designated domain name registries. ==History== Until 1999, Network Solutions Inc. (NSI) operated the com, net, and org registries. In addition to the function of domain name registry operator, it was also the sole registrar for these domains. However, several companies had developed independent registrar services. In 1996 one such company, NetNames, developed the concept of a standalone commercial domain name registration service which would sell domain registration and other associated services to the public, effectively establishing the retail arm of an industry with the registries being the wholesalers. NSI assimilated this model, which ultimately led to the separation of registry and registrar functions. In 1997, PGMedia filed an anti-trust suit against NSI citing the DNS root zone as an essential facility, and the US National Science Foundation (NSF) was enjoined to this action.〔Clausing, Jeri (19 September 1997) (National Science Foundation Is Added to Suit on Domain Names ). Partners.nytimes.com. Retrieved on 2013-02-08.〕 Ultimately, NSI was granted immunity from anti-trust litigation, but the litigation created enough pressure to restructure the domain name market. In October 1998, following pressure from the growing domain name registration business and other interested parties, NSI's agreement with the United States Department of Commerce was amended.〔(Registrar Accreditation: History of the Shared Registry System ). ICANN. Retrieved on 2013-02-08.〕 This amendment required the creation of a shared registration system that supported multiple registrars. This system officially commenced service on November 30, 1999 under the supervision of Internet Corporation for Assigned Names and Numbers (ICANN), although there had been several testbed registrars using the system since March 11, 1999. Since then, over 900 registrars have entered the market for domain name registration services.〔(ICANN Registrars ). dotandco.net〕 Of the registrars who initially entered the market, many have continued to grow and outpace rivals. Go Daddy is the largest registrar. Other successful registrars include eNom, Tucows, Melbourne IT. Registrars who initially led the market but later were surpassed by rivals include Network Solutions and Dotster. Each ICANN-accredited registrar must pay a fixed fee of US$4,000 plus a variable fee.〔(Registrar Accreditation Agreement ). ICANN. Retrieved on 2013-02-08.〕 The sum of variable registrar fees is intended to total US$3.8 million. The competition created by the shared registration system enables end users to choose from many registrars offering a range of related services at varying prices. 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「Domain name registrar」の詳細全文を読む スポンサード リンク
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