domain name naming authority
In domain name system terminology, the naming authority is the entity responsible for the allocation and distribution of domain names. A naming authority is often restricted to a particular level of domains such as .com, .net, or .edu.
See "Registering a Domain Name" and "Understanding Internet Governance" in the Did You Know...? section of Webopedia.
See also "Countries and Their Domain Extensions" in Webopedia's Quick Reference Section.