231-648 phone numbers

Numbers 231-648-0000 to 231-648-9999 are assigned to Level 3 Communications, LLC in Howard City, MI. 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 231-648-0xxx, 231-648-1xxx, 231-648-4xxx, 231-648-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 231-648