• Directory of Internet terms
  • Arin — American Registry for Internet Numbers. ARIN is a Regional Internet Registry (RIR), and is a non-profit membership organization established for the purpose of the administration and registration of Internet number resources--including Internet Protocol (IP) addresses and Autonomous System Numbers--in Canada, many Caribbean and North Atlantic islands, and the United States. ARIN also develops consensus-based policies and facilitates the advancement of the Internet through information and educational outreach.