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Overview#

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:

• Number Plan Area (NPA) - Area Code
• National Destination Code (NDC) - Central Office (telephone exchange Area Code) - Allowed ranges: 2–9 for the first digit, and 0–9 for both the second and third digits
  • however, in geographic area codes the third digit of the NDC cannot be 1 if the second digit is also 1 as to not interfere with N11 services.
• Subscriber Number (SN) - is the Unique Identifier for the End-User Phone Number
• 5XX - 5XX-NXX codes are in the format 5XX-NXX-XXXX. 5XX-NXX codes, each subsuming a block of 10,000 numbers, are assigned to service providers.

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 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:

• United States and United States Territories
• Canada
• Bermuda
• Anguilla
• Antigua & Barbuda
• Bahamas
• Barbados
• British Virgin Islands
• Cayman Islands
• Dominica
• Dominican Republic
• Grenada
• Jamaica
• Montserrat
• Sint Maarten
• Saint Kitts and Nevis
• Saint Lucia
• Saint Vincent and the Grenadines
• Trinidad and Tobago
• Turks & Caicos

More Information#

There might be more information for this subject on one of the following:

• 5XX
• 9-1-1
• Country Calling Code
• Easily Recognizable Code
• N11
• NANP
• NXX
• National Destination Code
• North American Numbering Plan Administrator
• Number Plan Area

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• [#1] - About The North American Numbering Plan Administrator (NANPA) - based on information obtained 2019-08-15