American Registry for Internet Numbers (ARIN)

Definition of American Registry for Internet Numbers (ARIN) in The Network Encyclopedia.

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What is ARIN?

A nonprofit organization that administers the registration of blocks of IP addresses to Internet service providers (ISPs) in those areas previously managed by Internet Network Information Center (InterNIC) via its designated representative Network Solutions, Inc., namely North and South America, the Caribbean, and sub-Saharan Africa.

IP address blocks are usually assigned to large national ISPs who then allocate smaller blocks to regional and metropolitan ISPs, who in turn allocate IP addresses to the networks of their corporate clients and dial-up users.

The acronym ARIN stands for American Registry for Internet Numbers.
IP address registration is administered in Europe by the Reseaux IP Europeans (RIPE) and in the Asia Pacific region by the Asia Pacific Network Information Center (APNIC). Two additional Internet Protocol (IP) registries are planned for the continents of Africa and South America.