424-678 phone numbers

Numbers 424-678-0000 to 424-678-9999 are assigned to Teleport Communications America, LLC in El Segundo, CA. 5 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 424-678-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 424-678