NANP (North American Numbering Plan)

The NANP is the plan for telephone numbers in Canada, the US and its territories, and the Caribbean. Telephone number addresses in the NANP are in the form NXX-NXX-XXXX, where N is any digit from 2-9 and X is any digit from 0-9. (The format often is expressed as NPA-NXX-XXXX to reflect the fact that the first three digits of the telephone number represent the area code.) The first six digits (NPA-NXX) of the telephone number identify the local serving switch. The NPA-NXX of a telephone number also indicates the geographic area (“rate area”) associated with the number. There are exceptions to the meaning of a number’s NPA-NXX, such as for “toll-free” numbers and those in certain specially designated NPA-NXXs.

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