What was the first internet top-level domain?
Top-level domain the Internet Assigned Numbers Authority (IANA), and is in charge of maintaining the DNS root zone. IANA currently distinguishes the following groups of top-level domains: domain (.arpa) Originally, the top-level domain space was organized into three main groups: "Countries", "Categories", and "Multiorganizations". An additional "temporary" group consisted of only the initial DNS domain, arpa, and was intended for transitional purposes toward the stabilization of the domain name system. As of 2015, IANA distinguishes the following groups of top-level domains: Countries are designated in the Domain Name System by their two-letter ISO country code; there are exceptions, however (e.g., .uk). This
Top-level domain Top-level domain A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet. The top-level domain names are installed in the root zone of the name space. For all domains in lower levels, it is the last part of the domain name, that is, the last label of a fully qualified domain name. For example, in the domain name www.example.com, the top-level domain is com. Responsibility for management of most top-level domains is delegated to specific organizations by the Internet Corporation for Assigned Names and Numbers (ICANN), which operates