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 number of the international E.164-number for geographic areas.
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