856-421 phone numbers

Numbers 856-421-0000 to 856-421-9999 are assigned to Onvoy, LLC in Port Norris, NJ. 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 856-421-1xxx, 856-421-4xxx, 856-421-7xxx, 856-421-8xxx, 856-421-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 856-421