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  1. support.bandwidth.com › hc › en-usWhat do the terms NPA and NXX mean? – Bandwidth Support Center

    Oct 30, 2023 · NXX, also known as the Central Office Code or Exchange, is a three-digit code that forms the second part of a 10-digit phone number. For example: In the phone number 555-101-1234, the NXX is 101. Article is closed for comments. NPA and NXX are standard industry terms that you may hear thrown around a lot when ordering or porting phone numbers.

  2. trestleiq.com › knowledge-base › understanding-npaUnderstanding NPA-NXX and the Implications of Number Portability

    Feb 28, 2024 · The first three digits of a local seven-digit telephone number. Assigned to a specific switch in a central office. Together, the NPA-NXX denotes the original carrier and central office switch assigned to a particular number. Historically, NPA-NXX combinations provided a reliable way to determine the carrier and approximate location of a number.

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  4. en.wikipedia.org › wiki › North_American_Numbering_PlanNorth American Numbering Plan - Wikipedia

    NXX often denoted NPA: Numbering plan area code The first NXX block is the numbering plan area code. When the second and third digits are the same, the code is an easily recognizable code (ERC). ERCs designate special services; e.g., 800 for toll-free service. The NANP is not assigning area codes with 9 as the second digit.

    • 1
    • 011
    • +1 NXX NXX-XXXX

  5. www.mycountrymobile.com › npa-nxxWhat Is NPA NXX? Decoding The Secrets Of Phone Numbers

    NPA: Stands for Numbering Plan Area and is more commonly known as an area code. It’s the first three digits of a phone number, designating a geographic region. NXX: Stands for Central Office Prefix or Exchange code. This is the second set of three digits within a phone number, representing a specific telephone exchange within an area code.

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  7. www.123.net › blog › in-depth-look-at-nxx-in-theNXX in the North American Numbering Plan - 123NET

    Feb 1, 2024 · The North American Numbering Plan (NANP) is a cornerstone of telecommunications in North America. The NXX central office code plays a crucial role within this structure. NXX is integral to the NANP’s 10-digit numbering system, which includes the area code (NPA), the central office code (NXX), and the line number.

  8. www.voip-info.org › npa-nxxThe North American Numbering Plan (NANP) - VoIP-Info

    Jul 14, 2005 · NXX identifies the Central Office (aka. Exchange) within the NPA; XXXX identifies the Station within the NXX; 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 ...

  9. www.linkedin.com › pulse › my-country-mobile-whatMy Country Mobile: What is NPA NXX? The Key to ... - LinkedIn

    Nov 20, 2023 · The first three digits (123) represent the NPA, indicating the area code. The next three digits (456) represent the NXX, indicating the central office exchange. The final four digits (7890 ...

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