The American Registry for Internet Numbers (ARIN) is the Regional Internet Registry (RIR) for Canaa, many islands in the Caribbean and North Atlantic ocean, and the United States. ARIN manages the distribution of Internet number resources, including IPv4 and IPv6 address space and Autonomous System 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, USA.