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NANPA: North American Numbering Plan AdministrationThis site provides information about the North American Numbering Plan (NANP) and its administration. The NANP is the numbering plan for the Public Switched Telephone Network for Canada, the US and its territories, and some Caribbean countries.
The NANP is administered by the North American Numbering Plan Administration (NANPA).  Today, this function is overseen by the Federal Communications Commission, which assumed the responsibility upon the breakup of the Bell System. The FCC solicits private sector contracts for the role of the administrator. Initially, the service was provided by a division of Lockheed Martin. In 1997, the contract was awarded to Neustar Inc.
This website provides a list of locations for all area codes in the USA, Canada and several Caribbean Islands. These codes are all regulated by the North American Numbering Plan Administration.
"Planning Letter 331: Recovery of NPA Codes 880, 881, 882 (Paid Toll-Free Service) Scheduled for April 1, 2004" (PDF). North American Numbering Plan Administration. 2003-06-02. Retrieved 2008-08-28.
INC guidelines and recommendations are used by the North American Numbering Plan Administration.
(CNAC) was incorporated on June 5, 1998 under the Canada Business Corporations Act. The CNAC operates under the regulatory oversight of the Canadian Radio-television and Telecommunications Commission (CRTC). The primary role of CNAC is to administer Canada's telecommunications numbering resources via the selection and funding of a neutral administrator who performs the functions of Canadian Numbering Administration (CNA) for the Canadian telecommunications industry. In addition, the CNAC pays the Canadian share of the costs of the North American Numbering Plan Administration.