North American Numbering Plan


North American Numbering Plan (NANP) is the Telephone Numbering Plan implemented within the United States, United States Territories about 20 Countries in total.

North American Numbering Plan format may be summarized in the notation NPA-NXX-XXXX:

National Destination Code (NDC) when combined with the Subscriber Number (SN) - will constitute the National Significant Number of the international E.164-number for geographic areas.

North American Numbering Plan Administrator (NANPA) holds overall responsibility for the neutral administration of NANP numbering resources, subject to directives from regulatory authorities in the countries that share the NANP. NANPA's responsibilities include assignment of NANP resources, and, in the United States and its United States Territories, coordination of area code relief planning and collection of utilization and forecast data.

NANPA is not a policy-making entity. In making assignment decisions, NANPA follows regulatory directives and industry-developed guidelines. NANPA's responsibilities are defined in Federal Communications Commission (FCC) rules and in comprehensive technical requirements drafted by the telecommunications industry and approved by the FCC.

North American Numbering Plan countries include:

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