area code 456
Area code 456 is a telephone area code in the North American Numbering Plan that has been withdrawn from use and is available for a new assignment.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.{{cite web
|url=https://www.nationalnanpa.com/pdf/old_pl/IL-93-08-002.pdf
|title=Assignment of NPA code "456" for International Carrier Identification
|date=1993-08-02
|publisher=Bellcore/North American Numbering Plan Administration
|access-date=2023-10-10
|url=https://www.nationalnanpa.com/pdf/PL_513.pdf
|title=Sunset of the Inbound International NPA (INT/NPA/NXX) Assignment Guidelines
|date=2017-11-27
|publisher=NANPA
|access-date=2023-10-10
}}
In November 2017, the area code 456 was withdrawn because of lack of demand.{{Cite web |title=NANPA : Numbering Resources - 456-NXX Codes |url=https://www.nationalnanpa.com/number_resource_info/456_codes.html |access-date=2023-04-25 |website=www.nationalnanpa.com}} It was returned to the pool of unassigned codes in 2023 and is available for future assignment as a geographic NPA.