443-304 phone numbers

Numbers 443-304-0000 to 443-304-9999 are assigned to Bandwidth.com CLEC, LLC in Arbutus, MD. 6 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 443-304-4xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 443-304