856-623 phone numbers

Numbers 856-623-0000 to 856-623-9999 are assigned to Five9, Inc. in Berlin, NJ.

Not assigned to any carrier: 856-623-1xxx, 856-623-2xxx, 856-623-3xxx, 856-623-4xxx, 856-623-5xxx, 856-623-6xxx, 856-623-7xxx, 856-623-8xxx, 856-623-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 856-623