603-618 phone numbers

Numbers 603-618-0000 to 603-618-9999 are assigned to Level 3 Communications, LLC (rate centre PIKE, NH, NANPA abbreviation).

Not assigned to any carrier: 603-618-0xxx, 603-618-1xxx, 603-618-2xxx, 603-618-3xxx, 603-618-5xxx, 603-618-6xxx, 603-618-7xxx, 603-618-8xxx, 603-618-9xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 603-618