608-431 phone numbers

Numbers 608-431-0000 to 608-431-9999 are assigned to Onvoy, LLC (rate centre FOUNTAINCY, WI, NANPA abbreviation). 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 608-431-4xxx, 608-431-5xxx, 608-431-6xxx, 608-431-7xxx, 608-431-8xxx, 608-431-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 608-431