501-643 phone numbers

Numbers 501-643-0000 to 501-643-9999 are assigned to Twilio International, Inc. in Little Rock, AR.

Not assigned to any carrier: 501-643-0xxx, 501-643-1xxx, 501-643-2xxx, 501-643-3xxx, 501-643-4xxx, 501-643-5xxx, 501-643-7xxx, 501-643-8xxx, 501-643-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 501-643