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A fully qualified domain name (FQDN), sometimes also referred to as an ''absolute domain name'',〔RFC 1035, ''Domain names: implementation and specification''〕 is a domain name that specifies its exact location in the tree hierarchy of the Domain Name System (DNS). It specifies all domain levels, including the top-level domain and the root zone. A fully qualified domain name is distinguished by its lack of ambiguity: it can be interpreted only in one way. The DNS root domain is unnamed, which is expressed by the empty label, resulting in a fully qualified domain name ending with the full stop (period) character. In contrast to a domain name that is fully specified, a domain name that does not include the full path of labels up to the DNS root, is often called a ''partially qualified domain name''. ==Syntax== A fully qualified domain name consists of a list of domain labels representing the hierarchy from the lowest relevant level in the DNS to the top-level domain (TLD). The domain labels are concatenated using the full stop (''dot'', ''period'') character as separator between labels. The DNS root is unnamed, expressed as the empty label terminated by the dot. This is most notable in DNS zone files in which a fully qualified domain name must be specified with a trailing dot. For example, ''somehost.example.com.'' explicitly specifies an absolute domain name that ends with the empty top level domain label. 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「fully qualified domain name」の詳細全文を読む スポンサード リンク
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