NXX definition

NXX or “Central Office Code" is the three-digit switch entity indicator that is defined by the fourth through sixth digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers.
NXX means the three-digit code, which appears as the first three digits of a seven-digit telephone number within a valid NPA or area code.
NXX. “NXX Code,” “COC,” “Central Office Code,” or “CO Code” is the three-digit switch entity indicator which is defined by the fourth, fifth and sixth digits of a 10-digit telephone number within NANP.

Examples of NXX in a sentence

  • NPAs are of the form NXX, where N represents the digits two (2) through nine (9) and X represents any digit zero (0) through nine (9).

  • Each Party is responsible for administering NXX codes assigned to it.

  • A single Central Office may handle several Central Office codes ("NXX").

  • Portability for an entire NXX shall be provided by utilizing reassignment of the NXX to CLEC through the LERG.

  • NXX codes assigned to mass calling on a choked network may not be ported using LNP technology but are portable using methods established by the NANC and adopted by the FCC.


More Definitions of NXX

NXX means the three-digit switch entity indicator that is defined by the “D”, “E”, and “F” digits of a 10-digit telephone number within the NANP. Each NXX contains 10,000 station numbers.
NXX means the fourth, fifth and sixth digits of a ten-digit telephone number.
NXXNXX Code," or "End Office Code" means the three digit switch entity indicator (i.e. the first three digits of a seven digit telephone number).
NXX. “NXX Code”, “Central Office Code”, or “CO Code” is the 3-digit switch indicator that is defined by the D, E, and F digits of a 10-digit telephone number within the North American Numbering Plan. Each NXX Code contains 10,000 telephone numbers.
NXX or “Central Office Code” means the three (3)-digit switch entity indicator that is defined by the fourth (4th) through sixth (6th) digits of a ten (10)-digit telephone number within the NANP. Each NXX Code contains ten thousand (10,000) station numbers.
NXX refers to the first three digits of a telephone number, which identify the specific telephone company central office that serves that number.
NXX means the numerical code used by the Company to indicate a specific central office within an NPA.