Industry Links

Where to Find Numbering Information

Here are some of the most useful official sites for numbering information. PLEASE NOTE: These links are off-site and will launch a new browser window.
This is the site for the Reassigned Numbers Database that securely houses all permanently disconnected US geographic and toll-free numbers, and the date of the most recent permanent disconnection of each of those numbers.

  • is the home page of the Wireline Competition Bureau. Here you will find orders related to numbering topics, including the NRO orders.
  • is the home page for the North American Numbering Council (NANC), a federal advisory committee that provides analysis and recommendations to the FCC on numbering issues. Here you will find their charter, meeting minutes, and membership lists.
  • provides an address and telephone number for each provider and identifies whether the provider offers local, wireless or toll services. The listed providers are those filing FCC Form 499-A, Telecommunications Reporting Worksheets.
  • is the home page for the Chair of the NANC. At this site, you can find presentations and reports provided to the NANC on issues currently being addressed by the Council.
This is the site for the Canadian Radio-television and Telecommunications Commission, the Canadian regulator.
This is the site for the national pooling administrator.
This is the site for the Number Portability Administration Center or NPAC for the United States. The NPAC facilitates local number portability, the ability to change your service provider while retaining your number.
This is the site for the Number Portability Administration Center or NPAC for Canada.
This is the Canadian Numbering Administrator's site. It is the master reference for Canadian number assignment information and includes Canadian numbering information similar to that provided by for the US and its territories.
This is the home page of the National Association of Regulatory Utility Commissioners. NARUC and its committees frequently take positions on numbering issues. At this site you can find links to all of the state commissions' web sites.
The North American Numbering Plan (NANP) is a numbering scheme for the public switched telecommunications networks (PSTN) within the United States, Canada and participating Caribbean countries. The NANP Fund was established to cover the costs of the NANP and is funded by United States telecommunication service providers, and from Canada and Caribbean member countries. Section 52.17 of the Federal Communications Commission's rules state that all telecommunications carriers in the United States shall contribute on a competitively neutral basis to meet the costs of establishing numbering administration.
This is the home page of the International Telecommunications Union in Geneva, the group that sets international standards for telephone numbers. Although much of the information on the site is available to ITU members only, some documents are available to all, including a recent list of assigned country codes.
This is the Alliance for Telecommunications Industry Solutions site. It has several sections of interest for numbering.

Within ATIS is the Industry Numbering Committee (INC). There are various subgroups active within INC, and you will find links to:

  • INC documents, where you can find all of the assignment guidelines for numbering resources.
  • INC working documents, where you will find documentation on, for example, what alternatives the industry is considering when we run out of 10-digit telephone numbers.
This site contains information about the 800 Service Management System (SMS/800) which is the central administration system for the management of Toll-Free Services.
This is the home page for Telecom Routing Administration, compilers and publishers of inconectiv's LERG Routing Guide and other numbering documentation.
This is the home page for the USA and Puerto Rico wireless number resource administrator for Mobile Identification Numbers (MIN), called the MIN Block Identifier (MBI). MBI Administration was created in 2002 when the MIN was separated from the Mobile Directory Number (MDN) and became a new number resource to support nationwide roaming, wireless number portability and number pooling.
This is the site of the National Exchange Carriers Association (NECA). NECA administers the FCC's "access charge" plan. (Access charges are the fees long distance companies pay to access the local phone network to complete calls.)
The Routing Number Administrator (RNA) is responsible for managing and assigning non-dialable p-ANIs (Pseudo-Automatic Number Identification) which are used to support the routing of wireless and VoIP 9-1-1 calls, out of the 211 NXX and 511 NXX on a national basis including Puerto Rico and the Virgin Islands.
This is the site of the National Emergency Number Association (NENA). NENA's mission is to foster the technological advancement, availability and implementation of a universal emergency telephone number system (9-1-1).
This is the site of the Common Short Code Administration (CSCA). CSCA administers Common Short Codes, are short codes to which an SMS or text message can be sent. Short codes are common across many wireless service providers in the U.S.

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