443-291 phone numbers

Numbers 443-291-0000 to 443-291-9999 are assigned to Level 3 Communications, LLC in Hampstead, MD. 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 443-291-0xxx, 443-291-1xxx, 443-291-4xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 443-291