← Area code 256
256-421 phone numbers
Numbers 256-421-0000 to 256-421-9999 are assigned to Charter Ip Enabled Services, LLC in Grant, AL. 1 of its ten thousand-number blocks are assigned to other carriers (number pooling).
Not assigned to any carrier: 256-421-2xxx, 256-421-3xxx, 256-421-4xxx, 256-421-5xxx, 256-421-6xxx, 256-421-7xxx, 256-421-8xxx, 256-421-9xxx — calls from these use spoofed caller IDs.
Source: North American Numbering Plan Administrator, Nov 3, 2026. Numbers can move between carriers.