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There are also 80 area codes reserved for future expansion of the numbering system, that is, those whose middle digit is 9. Article North American Numbering Plan expansion tells how they might be used. This makes a total of 322 currently unused area codes, or 40% of the total space of 800 possible area codes.
Các quốc gia theo NANP tại Bắc Mỹ. Kế hoạch đánh số điện thoại của Bắc Mỹ ( tiếng Anh: North American Numbering Plan, viết tắt là NANP) là một kế hoạch đánh số điện thoại đó bao gồm hai mươi lăm khu vực riêng biệt trong hai mươi quốc gia chủ yếu ở Bắc Mỹ, bao gồm ...
NORTH AMERICAN NUMBERING PLAN ADMINISTRATOR 1.1 NANP History The North American Numbering Plan (NANP) was developed by AT&T in 1947 to simplify and facilitate direct dialing of long-distance calls. NANP telephone numbers are ten-digit numbers consisting of a three-digit Numbering Plan Area (NPA) code, commonly called an area code, followed by a ...
456-NXX Codes. 555 Line Numbers. 555 Line Numbers. ANI II Digits. ANI II Digits. Vertical Service Codes. Vertical Service Codes. 800-855 Line Numbers. 800-855 Line Numbers.
Lists of North American area codes. The largest telephone numbering plan in North American is the North American Numbering Plan (NANP), serving 25 regions or countries. Other countries maintain an autonomous numbering plan with distinct country codes within the international E.164 specifications by the International Telecommunication Union .
The use of seven-digit phone numbers across the United States & Canada started in 1947 through the cooperation of local telephone operators, AT&T, and the Bell System. While the telephone was invented in 1876, it wasn’t actually until 70 years later that the North American Numbering Plan was created. The numbering system was part of a large ...
