NXX definition

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.
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.

Examples of NXX in a sentence

  • Access is also available to Directory Assistance and other services (by dialing the appropriate codes) when the services can be reached using valid NXX codes.

  • Access is also available to information services (e.g., time and temperature) and IC services by dialing the appropriate digits and other services when those services can be reached using valid NXX codes.

  • The CNA shall initiate CO Code reclamation in accordance with the Canadian Central Office (NXX) Code Assignment Guideline for all CO Codes allocated for testing purposes in the event that such CO Codes are not returned by the above carriers to the CNA in accordance with the Relief Implementation Schedule.

  • Each Carrier may establish two test numbers in a test CO Code (NXX) for the new NPA to facilitate testing of network and billing system functionality.

  • SCS will prefix any Access Code (if required), Home (HNPA) or Foreign Numbering Plan Area (FNPA) (if required), and NXX dialed by the subscriber before routing to the distant location.2. The four or five-digit abbreviated dialing ranges cannot be duplicated at any other SCS location or destination.


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 fourth, fifth and sixth digits of a ten-digit telephone number.
NXX means the three-digit code which appears as the first three digits of a seven 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.