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← Area code 423

423-674 phone numbers

Numbers 423-674-0000 to 423-674-9999 are assigned to Onvoy, LLC in Dayton, TN. 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 423-674-0xxx, 423-674-6xxx, 423-674-9xxx — calls from these use spoofed caller IDs.

Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.

Reported numbers in 423-674