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ATIS 0300055(2019-02)

NPA Allocation Plan and Assignment Guidelines

The Alliance for Telecommunications Industry Solutions, 08/24/2018

Publisher: ATIS

File Format: PDF

$144.00$288.97


Published:24/08/2018

Pages:29

This document specifies guidelines for the assignment of Numbering Plan Area (NPA) codes. NPA codes are the first three digits of the 10-digit North American Numbering Plan (NANP) format (the format is made up of 10 digits in the form of NXX-NXX-XXXX). NPA codes have traditionally been used to identify distinct exclusive geographic areas, commonly referred to as area codes.

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