231-320 phone numbers

Numbers 231-320-0000 to 231-320-9999 are assigned to Bandwidth.com CLEC, LLC (rate centre TRCHRIVBDG, MI, NANPA abbreviation). 6 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-320-3xxx, 231-320-6xxx, 231-320-7xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 231-320