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NPA-911 is forbidden as 9-1-1 is an emergency telephone number. (This is less restrictive than the rules prohibiting all three-digit N-1-1 codes as exchanges in all geographic area codes.) NPA-555 is reserved in every toll-free area code (except 800) for future information or directory assistance applications
Each rate center is associated with: a geographical place name (city, province/state) a nominal physical location (V and H co-ordinates) for distance calculations for billing purposes; one or more prefixes, in the form +1-NPA-NXX, which each identify a block of ten thousand directory numbers
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.
NANP telephone numbers are usually rendered as NPA-NXX-XXXX or (NPA) NXX-XXXX. For example, 250 555 0199, a fictional number, could be rendered as 250-555-0199, (250) 555-0199, 250-5550199, or 250/555-0199. The parentheses were originally used to indicate that the area code was not necessary for local dialing.
Public resistance to the introduction of new area codes, whether as overlay complexes (which allowed customers to keep their existing numbers, but broke seven-digit local calling) or by area code splits (where the area code of existing numbers was changed), prompted the FCC and state commissions to introduce thousands-block number pooling, i.e. the allocation of number space in blocks of only ...
Thus, NXX is a number from 200 through 999, while XXXX is a range from 0000 through 9999. The first three digits of a telephone number are the numbering plan area code (NPA code, or simply NPA). The next three, NXX, identify the central office and the last four digits are the line number of an individual office.
While the U.S. made an effort to document civilian casualty data during its presence in the country, the administration “had consistent problems in collecting and defining data, changed methods and failed to estimate the margin of uncertainty,” according to a report by the Center for Strategic and International Studies, a D.C.-based think tank.
NPA has the same syntax of NXX since the implementation of interchangeable area codes in 1995. The prefix NXX of the subscriber number is the central office code, unique in the numbering plan area. The place holder N stands for the digits 2 to 9, as the subscriber number may not begin with the digits 0 and 1.