American Registry for Internet Numbers

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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[1] after incorporating on 18 April 1997.[2] ARIN is a nonprofit corporation in the Commonwealth of Virginia, a U.S. state. It is headquartered in unincorporated Fairfax County, Virginia, by Washington Dulles International Airport in Chantilly.[3][4][5]

ARIN is one of five Regional Internet Registries (RIRs) in the world. Like the other RIRs, 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



ARIN provides services related to the technical coordination and management of Internet number resources. The nature of these services is described in ARIN's mission statement:

These services are grouped in three areas: Registration, Organization, and Policy Development.

Registration Services

Registration Services pertain to the technical coordination and inventory management of Internet number resources. Services include:

  • IPv4 address allocation and assignment
  • IPv6 address allocation and assignment
  • AS number assignment
  • Directory services including:
    • Registration transaction information (WHOIS)
    • Routing information (Internet Routing Registry)
  • DNS (Reverse)

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