414-666 phone numbers

Numbers 414-666-0000 to 414-666-9999 are assigned to Onvoy, LLC (rate centre MILWAUKZN1, WI, NANPA abbreviation). 9 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 414-666