413-633 phone numbers

Numbers 413-633-0000 to 413-633-9999 are assigned to Onvoy, LLC (rate centre SHELBUNFLS, MA, NANPA abbreviation). 2 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 413-633-0xxx, 413-633-4xxx, 413-633-5xxx, 413-633-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 413-633