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← Area code 423

423-600 phone numbers

Numbers 423-600-0000 to 423-600-9999 are assigned to Comcast Ip Phone, LLC in Apison, TN. 8 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 423-600-3xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 423-600