Established in December 1997, the American Registry for Internet Numbers (ARIN) is a Regional Internet Registry (RIR) incorporated in the Commonwealth of Virginia, USA. ARIN is one of five (5) RIRs. Like the other RIRs, ARIN:

• Provides services related to the technical coordination and management of Internet number resources in its respective service region. The ARIN service region includes Canada, many Caribbean and North Atlantic islands, and the United States;
• Participates in the global Internet community;
• Facilitates the development of policy decisions made by its members and the stakeholders in its region;
• Is a nonprofit, membership organization;
• Is governed by an executive board elected by its membership.

Source: ARIN