Number Plan Area


Number Plan Area (NPA Country Calling Code) is a Code which indicates which Telephone Numbering Plan is being applied.

Number Plan Area for North American Numbering Plan the Allowed ranges are:

  • (2–9) for the first digit
  • (0-9) for the second
  • (0-9) third digit

When the second and third digits of an area code are the same, that code is called an Easily Recognizable Code (ERC) which designate special services; e.g., 888 or 800 for toll-free service.

North American Numbering Plan is not assigning area codes with 9 as the second digit.

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