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The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
In March 2011, central office code relief was implemented by adding area code 531 in an overlay to the same service area of 402. Although the first central office prefix in 531 was not assigned until February 2013, ten-digit dialing has been mandatory for all calls from the 402 territory since Spring 2011. [1]
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.
Area codes in the NANP have three digits, while two digits are used in Brazil, one digit in Australia and New Zealand. Variable-length formats exist in multiple countries including: Argentina, Austria (1 to 4), Germany (2 to 5 digits), Japan (1 to 5), Mexico (2 or 3 digits), Peru (1 or 2), Syria (1 or 2) and the United Kingdom. In addition to ...
An N11 code (pronounced Enn-one-one) is a three-digit dialing code used in abbreviated dialing in the North American Numbering Plan (NANP). The mnemonic N stands for the digits 2 through 9 and thus the syntax stands for the codes 211 , 311 , 411 , 511 , 611 , 711 , 811 , and 911 .
TIM there are many legacy 9-digit numbers 361: 13 (3 10) TIM operator reserved (TACS legacy routing number) 362: 13 (3 10) TIM operator reserved (GSM/UMTS routing number) 363: 12 ("36" 10-digit MSISDN) TIM operator reserved (voice mail) 366: 10: TIM: 368: 9-10: TIM there are many legacy 9-digit numbers 370: 10
The three-digit codes were assigned to numbering plan areas in seemingly random manner, avoiding consecutive, nearly-consecutive, or just very similar codes in neighboring numbering plan areas to avoid customer confusion, [12] even when located in the same jurisdiction. This criterion was not always achieved, however.
Area code 603 in a 1956 map, covering the whole state.. Area code 603 is the sole area code for the U.S. state of New Hampshire in the North American Numbering Plan (NANP). It was created as one of the original 86 numbering plan areas in October 1947.