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The average number of pulses is 12; there are 28 potential NPAs with fewer than 12 pulses, 28 with more than 12 pulses, and 8 with exactly 12 pulses. These 8 are apparently "reserved", as none of them were included in the 1947 NPA assignments. Of the 28 potential NPAs with fewer than 12 pulses, all 28 were assigned.
North America United States, Canada, and other NANP countries. Twenty-four countries and territories share the North American Numbering Plan (NANP), with a single country code, 1. The formatting convention for telephone numbers is (NPA) NXX-XXXX, where NPA is the three-digit area code, and NXX-XXXX is the seven-digit subscriber number.
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.
The North American Numbering Plan conforms with International Telecommunication Union (ITU) Recommendation E.164, which establishes an international numbering framework. (en) Le plan de numérotage nord-américain (North American Numbering Plan ou NANP) est un système intégré de numérotation téléphonique commun à 20 pays en Amérique du ...
Regulatory authorities in each participating country have plenary authority over numbering resources, but the participating countries share numbering resources cooperatively. 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.
N. N11 code. North American Numbering Council. List of North American Numbering Plan area codes. North American Numbering Plan expansion. Telephone number pooling. Numbering Resource Utilization/Forecast Report.
