• ATIS 0300055
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ATIS 0300055

  • NPA Allocation Plan and Assignment Guidelines
  • standard by Alliance for Telecommunication Industry Solutions, 03/06/2015
  • Publisher: ATIS

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Reissued with the resolution of issue 786.

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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