ATIS 0300055

NPA Allocation Plan and Assignment Guidelines

The Alliance for Telecommunications Industry Solutions, 11/09/2012

Publisher: ATIS

File Format: PDF

$132.00$265.91

Description

Published:09/11/2012

Pages:29

Reissued with the resolution of issue 741.

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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