https://github.com/ralphhightower/nanpatelephoneformatdetection

North American Numbering Plan
https://github.com/ralphhightower/nanpatelephoneformatdetection

nanpa north-american-numbering-plan-administration northamericannumberingplanadministration ralph-hightower ralphhightower

Last synced: about 1 month ago
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North American Numbering Plan

• Host: GitHub
• URL: https://github.com/ralphhightower/nanpatelephoneformatdetection
• Owner: RalphHightower
• Created: 2022-12-22T02:27:00.000Z (about 2 years ago)
• Default Branch: main
• Last Pushed: 2024-03-28T17:55:57.000Z (9 months ago)
• Last Synced: 2024-04-14T03:01:48.652Z (8 months ago)
• Topics: nanpa, north-american-numbering-plan-administration, northamericannumberingplanadministration, ralph-hightower, ralphhightower
• Language: C#
• Homepage: https://ralphhightower.github.io/NANPATelephoneFormatDetection/
• Size: 85 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md

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README

        
# [North American Numbering Plan Administrator](https://nationalnanpa.com/)

## NANPATelephoneFormatDetection

North American Numbering Plan 

The formatting rules:

- Easily Recognizable Codes	When the second and third digits of an area code are the same, that code is called an easily recognizable code (ERC). ERCs designate special services; e.g., 888 for toll-free service.

- N11	These 8 ERCs, called service codes, are not used as area codes.

- N9X	The 80 codes in this format, called expansion codes, have been reserved for use during the period when the current 10-digit NANP number format undergoes expansion.

- 37X and 96X	Two blocks of 10 codes each have been set aside by the INC for unanticipated purposes where it may be important to have a full range of 10 contiguous codes available.

- (?\^(\[2-9\](11\|22\|33\|44\|55\|66\|77\|88\|99)$))\|

  - (

    - (?\^(5\(00\|21\|22\|23\|24\|25\|26\|27\|28\|29\|33\|44\|66\|77\|88\))\|

    - (?\^(6(00\|22))\|

    - (?\^(700))\|

    - (?\^(710))|

    - (?\^(8\(00\|33\|44\|55\|66\|77\|88)))\|

    - (?\^(900)

  - )(?\(\[2-9\]\[0-9\]\[0-9\])-(?\\[0-9\]{4}))

- (?\(\[2-9\]9\[0-9\])\|((37\|96)\[0-9\]))-\[2-9\]\[0-9\]\[0-9\]-\[0-9\]\{4\}$

- (?\^(\[2-9\]\[0-8\]\[0-9\])-555-(?\(1212|4334)$)\|

- (?\^\[2-9\]\[0-8\]\[0-9\])-555-(?\(01\[0-9\]\[0-9\]))$\|

- (?\(\[2-9\]\[0-8\]\[0-9\]))-(?\(\[2-9\]\[0-9\]\[0-9\]))-(?\(\[0-9\]\{4\}))$

The rules:

1. Numbers must be in the following format: ddd, or ddd-ddd-dddd. No parentheses are allowed. 

2. If ERC is a group that is matched and the length is greater than 3, the number is invalid. 

[Zip file of Central Office Codes Report — Updated daily](https://www.nationalnanpa.com/nanp1/allutlzd.zip)