American Registry for Internet Numbers references on wikipedia
American_Registry_for_Internet_Numbers The American Registry for Internet Numbers (ARIN) is the Regional Internet Registry (RIR) for Canada, many Caribbean and North Atlantic islands, and the United States. ARIN manages the distribution of Internet number resources, including IPv4 and IPv6 address space and AS numbers. ARIN opened its doors for business on 22 December 1997 after incorporating on 18 April 1997. ARIN is a nonprofit corporation in the Commonwealth of Virginia, a U.S. state.