423-665 phone numbers

Numbers 423-665-0000 to 423-665-9999 are assigned to Level 3 Communications, LLC in Charleston, TN. 8 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 423-665-8xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 423-665