443-507 phone numbers

Numbers 443-507-0000 to 443-507-9999 are assigned to Teleport Communications America, LLC in Hampstead, MD. 8 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 443-507-2xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 443-507