603-592 phone numbers

Numbers 603-592-0000 to 603-592-9999 are assigned to Mcimetro Access Transmission Services LLC (rate centre SPOFFORD, NH, NANPA abbreviation). 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 603-592-0xxx, 603-592-2xxx, 603-592-3xxx, 603-592-6xxx, 603-592-7xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 603-592