628-257 phone numbers

Numbers 628-257-0000 to 628-257-9999 are assigned to Race Telecommunications, Inc. in Mill Valley, CA. 9 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 628-257-0xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 628-257