ICANN | Top-Level Domains (gTLDs): "The right-most label in a domain name is referred to as its 'top-level domain' (TLD).
The DNS forms a tree-like hierarchy. Each TLD includes many second-level domains (such as 'icann' in 'www.icann.org'); each second-level domain can include a number of third-level domains ('www' in 'www.icann.org'), and so on.
The responsibility for operating each TLD (including maintaining a registry of the second-level domains within the TLD) is delegated to a particular organization. These organizations are referred to as 'registry operators', 'sponsors', or simply 'delegees.'"
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Wednesday, June 22, 2011
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