NXX definition

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.
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.

Examples of NXX in a sentence

  • The above information will be provided by CUSTOMER by submitting to BellSouth a fully completed “CO Code Assignments Months To Exhaust Certification Worksheet – TN Level” (“MTE Worksheet”), Appendix B to the Central Office Code (NXX) Assignments Guidelines, INC 95-0407-008 for each rate center where CUSTOMER will be requesting intermediate telephone numbers.

  • When Applicant is assigned one or more NXX codes, Applicant shall limit each of its NXX codes to a single local exchange or rate center, whichever is larger, and shall establish a toll rate center in each exchange or rate center proximate to that established by the telecommunications utility or cooperative corporation serving the exchange or rate center.


More Definitions of NXX

NXX means the three-digit code that appears as the first three digits of a seven-digit telephone number within a valid area code (i.e., an NXX other than a special 500, 600, 700, 800 or 900 code).
NXX means the three-digit code which appears as the first three digits of a seven digit telephone number.
NXX means the fourth, fifth and sixth digits of a ten-digit telephone number.
NXX. NXX 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 three digit switch entity indicator which is defined by the "D", "E", and "F" digits of a 10-digit telephone number within the NANP. Each NXX Code contains 10,000 station numbers. Historically, entire NXX code blocks have been assigned to specific individual local exchange end office switches.
NXX means a three-digit code valid within an area code (i.e., numbering plan area or “NPA”) which appears as the first three digits of a seven digit telephone number with the exception of the special 500, 600, 700, 800, and 900 codes and other similar special codes which may come into common usage in the future.
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.