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Central Office (CO) Code. A Central Office (CO) code or NXX code refers to the second three digits (also called digits D-E-F) of a ten-digit telephone number in the form of NPA-NXX-XXXX, where N represents any one of the numbers 2 through 9 and X represents any one of the numbers 0 through 9. CO codes are also known as an exchange, or prefix ...
The basic format of a phone number in any of these countries is NPA-NXX-XXXX or (NPA) NXX-XXXX. NPA : Area codes came into use during the early 1940s. NPA codes were developed by AT&T and the Bell System to divide the coverage area into "number plan areas" (abbreviated NPA).
Find all NPA NXX used in a geographic area. This lookup uses the NALENND ® North American Local Exchange NPA NXX Database™ - Rate Center Edition to find the telephone exchange Rate Centers, area codes (NPA), and prefixes (NXX) used in the area surrounding any United States, Canadian, or Caribbean location. Click on the map or enter a United ...
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.
Jul 14, 2005 · In NPAs that do not require overlay facilities numbers of the form NXX-XXXX are colloquially referred to as local and numbers of the form 1-NPA-NXX-XXXX are known as long distance. In certain NPAs, particularly large urban areas, the maximum number of available NXX and Station code combinations has been reached, requiring additional non-toll ...
Jul 27, 2018 · NPA (Number Planning Area/Number Plan Area/Numbering Plan Area), also known simply as an Area Code, is the three-digit number that identifies the telephone service region. For example, if you have the phone number 555-101-1234, the NPA would be 555. While the Area Code identifies the telephone service region, it’s possible for a single NPA to ...
Area Code Time Zone List. The Numbering Plan Area code is the first three digits of a 10 digit NANP telephone number. The NPA, combined with the Central Office Code or NXX, is the Destination Code being reported. An NPA is commonly referred to as an Area Code. The number format is NXX (where N=2-9, X=0-9).
