Skip to content

ARIN – American Registry for Internet Numbers

The ARIN which is short for American Registry for Internet Numbers is the regional internet registry for North American countries like the United States of America, Canada and lots of Caribbean and North Atlantic Islands. This internet registry authority manages the distribution and allocation of internet number resources which includes the Internet Protocol version 4 (IPv4) and the new version Internet Protocol version 6 (IPv6).  The ARIN is partly responsible when you buy IPv4 address blocks.

On December 22, 1997, ARIN started doing business after it has been incorporated in April 18, 1997. This regional internet registry is a non-profit corporation based in Chantilly, Virginia, United States.

We currently have five regional internet registries in the world and ARIN is one of them. And like the rest of the regional internet registries, ARIN have been doing the following things:

  • They provide or offer services that are directly related to the technical coordination and management of internet number resources.
  • ARIN also facilitates policy and regulation development by its members and its stakeholders.
  • This regional internet registry joins in the international internet community
  • ARIN is a non-profit, community based organization based in Virginia, USA
  • This non-profit organization is being governed by an executive board that is being elected by all of its members.

Services offered

ARIN offers services that are linked to the technical coordination and management of internet number resources. The nature of these services is clearly defined in the regional internet registry’s mission statement.

“Applying the principles of stewardship, ARIN, a nonprofit corporation, allocates Internet Protocol resources; develops consensus-based policies; and facilitates the advancement of the Internet through information and educational outreach”.

These services that they provide are being grouped in three major areas or section: the Registration, the Organization, and the Policy Development.

The Registration Services

This clearly relates to the technical coordination and inventory management of internet number resources. The services offered may include the following:

  IPv4 address allocation and assignment. So when you buy IPv4 Address blocks ARIN is responsible in the allocation and the assigning of this IP.

  IPv6 address allocation and assignment. ARIN is also responsible in the allocation and distribution of IPv6.

  AS number assignment

  Directory services including:

  • Registration transaction information (WHOIS)
  • Routing information (Internet routing registry)

  DNS (Reverse)

For more information about requesting internet number resources from this regional internet registry you check out their website at This section includes the templates being requested, the specific distribution rules and policies, and the guidelines when you request and for managing internet number resources. You can also check ARIN’s website if you want to buy IPv4 address blocks.

Organization Services

This branch of service refers to the interaction between the stakeholders, the members in the internet registry, and ARIN itself. Among the services that they provide includes the following:

  • Elections
  • Meetings of members
  • Information publication and the distribution of the information
  • Education and training

Policy Development Services

This type of service aid and assist the development of policy for the technical coordination and the management of internet number resources.

The community had set the All Policies inside ARIN.  The public is encouraged to join in the policy development process which is done at the public policy meetings and on the Public Policy Mailing List. The ARIN Board of Trustees ratifies and endorses the policies only after the following have been met satisfactorily.

  1. discussion on mailing lists and at meetings;
  2. ARIN Advisory Council recommendation;
  3. community consensus in favor of the policy; and
  4. full legal and fiscal review.

To participate in all of ARIN’s policy development process, membership is not totally required. Membership is not also needed if you need to apply for Internet number resources.

The services consist of:

  • sustain and preserve discussion e-mail lists
  • carry out public policy meetings
  • circulating policy documents

Board of Trustees

The ARIN membership selects the Board of Trustees (BoT) through election. The Board of Trustees has the ultimate responsibility for the business affairs and for the financial health of the regional internet registry. The BoT has 7 members which consist of a President and CEO, a chairman, a treasurer, and others.

The BoT also manages the ARIN’s operations in a way consistent with the policies and guidelines received from the Advisory Council and the goals set the members of the registry.

This set of officers is responsible for knowing and determining the nature of all revenues received in order to make sure that all services are given in a reasonable way and manner. Proposals that have been generated from the members are ratified by the BoT and are submitted through the Advisory Council. All executive decisions are carried out after the approval of the Board of Trustees.

Advisory Council

Aside from the Board of Trustees, the Advisory Council also provides advises to the ARIN on the IP address allocation policy and related matters like when you buy IPv4 address blocks. Following to the procedures in the Internet Resource Policy Evaluaiotn Process, this council forwards consensus based rules and regulations to the Board of Trustees in order for the BoT to ratify the proposals. The Advisory Council has 15 elected members. They compose of a Chairman, Vice Chairman, and others.

A Brief History

In December 1997, the organization was established in order to give IP Registration services as an independent, non-profit corporation. Some people at that time were already thinking to buy IPv4 address blocks long before it is exhausted.

IP registrations during this time, especially those outside RIPE and APNIC regions, was done with accordance with the policies and regulations that have been set by the governing body like the IETF by Network Solutions Corporation which was part of the InterNIC project.The National Science Foundation granted the plan for the creation of the not-for-profit organization in order to “”give the users of IP numbers a vice in the policies by which they are being managed and allocated within the North America region. Please remember that these IP numbers were mostly internet service providers, corporations and other big groups and institutions. And as part of the conversion, Network Solutions Corporation converted these tasks including its initial staff and computer infrastructure to ARIN.

Scott Bradner, John Curran, Kim Hubbard, Don Telage, Randy Bush and Raymundo Vega Aguilar were the first Board of Trustees. Jon Postel of IANA was also part of the initial BoT.

Kim Hubbard became ARIN’s first president from 1997 up to 2000. Raymond “Ray” Plzak took over Hubbard’s position from 2000 to 2008. John Curran became acting president from 2008 to July of 2009 until he took the CEO job permanently. During the late 2002, ARIN serviced Mexico, Central America and South America. It also served all of the Caribbean.

The LACNIC has served parts of the Caribbean, Mexico, Central America, and the South America. The Sub-Saharan Africa was also part of LACNIC until April 2005, before AfriNIC became the 5th regional internet registry and was fully recognized by ICANN.      

On September 24, 2015, those planning to buy IPv4 address blocks may be in for a big surprise, as ARIN declared the exhaustion of the ARIN IPv4 address pool. 

Service region

The countries and territories in the ARIN service region include the following:

  • Anguilla (United Kingdom)
  • Antarctica
  • Antigua and Barbuda
  • Barbados
  • Bermuda Island (United Kingdom)
  • Bouvet Island (Norway)
  • British Virgin Islands (United Kingdom)
  • Canada
  • The Cayman Islands (United Kingdom)
  • Collectivity of Saint Martin (France)
  • Dominican Republic
  • Grenada
  • Guadeloupe (France)
  • Heard Island and McDonald Islands (Australia)
  • Jamaica
  • Martinique (France)
  • Montserrat (United Kingdom)
  • Puerto Rico (United States)
  • Saint Barthélemy (France)
  • Saint Helena, Ascension and Tristan da Cunha (United Kingdom)
  • Saint Kitts and Nevis
  • Saint Lucia
  • Saint Pierre and Miquelon (France)
  • Saint Vincent and the Grenadines
  • The Bahamas
  • Turks and Caicos Islands (United Kingdom)
  • United States of America
  • United States Minor Outlying Islands (United States)
  • United States Virgin Islands (United States)


Below are former service regions

ARIN formerly covered the following countries and territories, Angola, Botswana, Burundi, Republic of Congo, Democratic Republic of Congo, Lesotho, Malawi, Mozambique, Namibia, and Rwanda. Also in the list are The Republic of South Africa, Swaziland, Tanzania, Zambia and Zimbabwe. These countries were under ARIN until AfriNIC was officially established.

ARIN formerly covered Argentina, Aruba, Belize, Bolivia, Brazil, Chile, Colombia, Costa Rica, Cuba, Dominican Republic, Dutch West Indies, Ecuador, El Salvador, Falkland Islands (UK Territory), French Guiana, Guatemala, Guyana, Haiti, Honduras, Mexico, Nicaragua, Panama and Paraguay. Also in their list are the country of Peru, South Georgia and South Sandwich Islands, Suriname, Trinidad and Tobago, Uruguay and Venezuela. These countries and territories were also part of ARIN until LACNIC was formed. During this times, there were still businesses who wants to buy IPv4 address blocks, however the exhaustion of this old IP address prompted the way for IPv6.