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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.
The North American Numbering Plan is based on a ten-digit telephone number assigned to each telephone in the telephone network. The number is composed of the three-digit numbering plan area code, a three-digit central office code, and a four-digit station or line number. Certain rules govern the numerical format of each part.
A broad division is commonly recognized between closed and open numbering plans. 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 ...
AT&T developed the North American Numbering Plan in 1947 to simplify and facilitate direct dialing of long distance calls. Implementation of the plan began in 1951. The International Telecommunications Union (ITU) assigned country code "1" to the NANP area. The NANP conforms with ITU Recommendation E.164, the international standard for ...
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 ...
The North American Numbering Plan, or NANP, is the telephone numbering plan for the PSTN (Public Switched Telephone Network) for World Zone 1, one of the nine international calling code regions defined by the International Telecommunication Union (ITU). World Zone 1 comprises twenty countries, mainly in North America and the Caribbean.
Dec 5, 2017 · The North American Numbering Plan, which the Bell System put into place starting in the 1940s, was designed to replace a far-more-complicated system that relied on operators to manually move calls ...
