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[North American Numbering Plan Administrator](https://nationalnanpa.com/)\n\n## NANPATelephoneFormatDetection\n\nNorth American Numbering Plan \nThe formatting rules:\n\n- Easily Recognizable Codes\tWhen 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.\n- N11\tThese 8 ERCs, called service codes, are not used as area codes.\n- N9X\tThe 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.\n- 37X and 96X\tTwo 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.\n\n- (?\\\u003cERC\\\u003e^(\\[2-9\\](11\\|22\\|33\\|44\\|55\\|66\\|77\\|88\\|99)$))\\|\n  - (\n    - (?\\\u003cNonGeoSvc\\\u003e^(5\\(00\\|21\\|22\\|23\\|24\\|25\\|26\\|27\\|28\\|29\\|33\\|44\\|66\\|77\\|88\\))\\|\n    - (?\\\u003cCAservices\\\u003e^(6(00\\|22))\\|\n    - (?\\\u003cInterExch\\\u003e^(700))\\|\n    - (?\\\u003cUSgovt\\\u003e^(710))|\n    - (?\\\u003cTollFree\\\u003e^(8\\(00\\|33\\|44\\|55\\|66\\|77\\|88)))\\|\n    - (?\\\u003cPremium\\\u003e^(900)\n  - )(?\\\u003cSpecExchange\\\u003e(\\[2-9\\]\\[0-9\\]\\[0-9\\])-(?\\\u003cSpecNumber\\\u003e\\[0-9\\]{4}))\n- (?\\\u003cReservedAreaCode\\\u003e(\\[2-9\\]9\\[0-9\\])\\|((37\\|96)\\[0-9\\]))-\\[2-9\\]\\[0-9\\]\\[0-9\\]-\\[0-9\\]\\{4\\}$\n- (?\\\u003cInfoAreaCode\\\u003e^(\\[2-9\\]\\[0-8\\]\\[0-9\\])-555-(?\\\u003cInfoNum\\\u003e(1212|4334)$)\\|\n- (?\\\u003cEntAreaCode\\\u003e^\\[2-9\\]\\[0-8\\]\\[0-9\\])-555-(?\\\u003cEntNumber\u003e(01\\[0-9\\]\\[0-9\\]))$\\|\n- (?\\\u003cAreaCode\\\u003e(\\[2-9\\]\\[0-8\\]\\[0-9\\]))-(?\\\u003cExchange\u003e(\\[2-9\\]\\[0-9\\]\\[0-9\\]))-(?\\\u003cNumber\\\u003e(\\[0-9\\]\\{4\\}))$\n\nThe rules:\n\n1. Numbers must be in the following format: ddd, or ddd-ddd-dddd. No parentheses are allowed. \n2. If ERC is a group that is matched and the length is greater than 3, the number is invalid. \n\n[Zip file of Central Office Codes Report — Updated daily](https://www.nationalnanpa.com/nanp1/allutlzd.zip)\n[![OpenSSF Baseline](https://www.bestpractices.dev/projects/12811/baseline)](https://www.bestpractices.dev/projects/12811)\n\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fralphhightower%2Fnanpatelephoneformatdetection","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fralphhightower%2Fnanpatelephoneformatdetection","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fralphhightower%2Fnanpatelephoneformatdetection/lists"}