American Registry for Internet Numbers
The American Registry for Internet Numbers (ARIN) is the regional Internet registry  for the United States, Canada, and many Caribbean and North Atlantic islands. ARIN manages the distribution of Internet number resources, including IPv4 and IPv6 address space and AS numbers. ARIN opened for business on December 22, 1997 after incorporating on April 18, 1997. ARIN is a nonprofit corporation with headquarters in Chantilly, Virginia, United States.ARIN is one of five regional Internet registries in the world. Like the other regional Internet registries, ARIN:

Provides services related to the technical coordination and management of Internet number resources
Facilitates policy development by its members and stakeholders
Participates in the international Internet community
Is a nonprofit, community-based organization
Is governed by an executive board elected by its membership