!!! Overview
[{$pagename}] ([NANP]) is the [Telephone Numbering Plan] implemented within the [United States], [United States Territories] about 20 Countries in total.

[{$pagename}] 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].


[{$pagename}] 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:
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* [#1] - [About The North American Numbering Plan Administrator (NANPA)|https://www.nationalnanpa.com/about_us/index.html|target='_blank'] - based on information obtained 2019-08-15