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← Area code 423

423-722 phone numbers

Numbers 423-722-0000 to 423-722-9999 are assigned to Level 3 Communications, LLC (rate centre JOHNSON CY, TN, NANPA abbreviation). 3 of its ten thousand-number blocks are assigned to other carriers (number pooling).

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

Reported numbers in 423-722