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What is a numbering plan area code?
What is an area code overlay complex?
What is the North American numbering plan (NANP)?
How do NPA codes work?
A numbering plan area with multiple area codes is called an overlay. Area codes are also assigned for non-geographic purposes. The rules for numbering NPAs do not permit the digits 0 and 1 in the leading position. [1] Area codes with two identical trailing digits are easily recognizable codes (ERC).
- 368, 403, 568, 587, 780, 825
- 204, 431, 584
- 236, 250, 257, 604, 672, 778
- 428, 506
An area code overlay is a numbering plan area (NPA) in the North American Numbering Plan (NANP) that has multiple area codes assigned. Overlay complexes are used to add central office prefixes in an NPA to increase the number of available telephone numbers. [1]
Overlay Area Codes(added)Overlay Area Codes(base)Location557314St. Louis, Missouri (communities such as, ...324904Jacksonville, Jacksonville Beach, ...Central and southeastern OhioIn telecommunications, an area code overlay complex is a telephone numbering plan that assigns multiple area codes to the same geographic numbering plan area (NPA). Area code overlays are implemented in territories of the North American Numbering Plan (NANP) to mitigate exhaustion of central office codes in growth areas.
- Format of NANP Phone Numbers
- Which Countries Are Included in The Nanp?
- Additional Facts About The North American Numbering Plan
NANP phone numbers are assigned the country code (1) by the International Telecommunications Union (ITU). NANP numbers are ten-digits long. This includes a three-digit Numbering Plan Area (NPA) code — an area code followed by a seven-digit local number or subscriber number. The format is usually represented as: +1 NXX-NXX-XXXX.
Anguilla: 264Antigua & Barbuda: 268Bahamas (the): 242Barbados: 246Dialing between two NANP countries is quick and easy. Users simply dial the country dialing code, followed by the NPA area code, and a 7-digit local number. For example, when calling from the US to Barbados, users will dial +1 (246) xxx-xxxx. Even though all numbers within the NANP share the same numbering plan and resources, calls made between NAN...
Numbering plan areas may be assigned multiple area codes to provide adequate numbering resources, in which case the local numbering plan is called an overlay. Area codes are also assigned for non-geographic purposes.
NPA (Area) Codes. The area served by the NANP is divided into smaller Numbering Plan Areas (NPAs), each identified by a three-digit NPA code, commonly called an area code. For quick information about a specific area code, use the area code search.
This site provides information about the North American Numbering Plan (NANP) and its administration. The NANP is the numbering plan for the Public Switched Telephone Network for Canada, the US and its territories, and some Caribbean countries. Transition to 10-Digit dialing for 988 More Information NANPA Web Guide NANPA Help Desk.
