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 customer shall specify the LATAs from which they wish to receive originating 900 Access Service calls, the 900 NXX codes to be activated in a given LATA and the desired due date of the order.

All remaining 717 NXX codes would be assigned only to the non-overlaid area.

The overlay area inside Area B includes 24 rate centers, with Harrisburg City Zone 1 having the greatest number of NXX codes.

Those customers in the non-overlaid area of the 717 NPA would retain seven-digit dialing until the remaining 717 NXX codes were assigned and the overlay would then be extended to all rate centers in the 717 NPA.

During 2009 the total code assignments through July was 21 codes or 3.0 codes per month.• Assignment History: 2008 – 25 assigned; 2007 – 18 assigned; 2006 – 32 assigned There are 40 code holders in the 717 NPAThe 717 NPA has 107 rate centers: 12 rate centers have one NXX code assigned, 26 rate centers have two NXX codes assigned and one rate center has 124 codes assigned (Harrisburg City Zone 1, the tenth largest city in Pennsylvania).


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 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. 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 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.