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A country code second-level domain (ccSLD) is a second-level domain to a country code top-level domain. A ccSLD may be reserved by the domain name registry for the registration of third-level domains or assigned to a third party as a subdomain. Many country code domain registries implement domain name classes at the second level underneath their ccTLD, such as are present in the original generic top-level domains com, net, and org, which were intended for commercial entities, network operators, and non-profit organizations, respectively. Many countries implement additional classes as well. For example, the United Kingdom (uk) uses co.uk for commercial purposes and ac.uk for academic registrants. Brazil (br) has a high number of restricted second-level domains, currently〔(Registro.br ) 4 February 2011〕 amounting to 67; they range from com.br for commercial activities, vet.br for veterinarians, to wiki.br for wikis.〔http://registro.br/info/dpn.html Brazil registry information〕 ==See also== *Domain Name System *Private sub-domain registry 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「Country code second-level domain」の詳細全文を読む スポンサード リンク
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