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What is the North American numbering plan?
What is a numbering plan area code?
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Why are three digit codes assigned to a numbering plan area?
International access. 011. List of dialing codes. The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1.
- List of North American Numbering Plan area codes - Wikipedia
Each NPA is identified by one or more numbering plan area...
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This is a list of North American telephone area codes in...
- Original North American area codes - Wikipedia
The United States received seventy-seven area codes, and...
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The North American Numbering Plan (NANP) is a telephone...
- List of North American Numbering Plan area codes - Wikipedia
The North American Numbering Plan ( NANP) is a telephone numbering plan for twenty-five regions in twenty countries, primarily in North America and the Caribbean. This group is historically known as World Zone 1 and has the telephone country code 1. Some North American countries, most notably Mexico, do not participate with the NANP.
A closed numbering plan, as found in North America, features fixed-length area codes and local numbers, while an open numbering plan has a variance in the length of the area code, local number, or both of a telephone number assigned to a subscriber line. The latter type developed predominantly in Europe.
