Area code 423 is a telephone area code in the North American Numbering Plan that has been withdrawn from use and is available for a new assignment.
The area code was in use as non-geographic area code from 1993 until 2017 to route inbound calls from outside the territories of the North American Numbering Plan to specific carriers for carrier-specific services.[1][2]
In November 2017, the area code 456 was withdrawn because of lack of demand.[2][3] It was returned to the pool of unassigned codes in 2023 and is available for future assignment as a geographic NPA.
^"Assignment of NPA code "456" for International Carrier Identification" (PDF). Bellcore/North American Numbering Plan Administration. 1993-08-02. Retrieved 2023-10-10.
^ ab"Sunset of the Inbound International NPA (INT/NPA/NXX) Assignment Guidelines" (PDF). NANPA. 2017-11-27. Retrieved 2023-10-10.
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calling areas. When dialling, if you wish to call a person in another local calling area, you must dial the trunk prefix followed by the areacode. Below...
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