617-231 phone numbers

Numbers 617-231-0000 to 617-231-9999 are assigned to Level 3 Communications, LLC in Watertown, MA. 4 of its ten thousand-number blocks are assigned to other carriers (number pooling).

Not assigned to any carrier: 617-231-5xxx — calls from these use spoofed caller IDs.

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

Reported numbers in 617-231