Prefix 617-617 — Boston, MA
617-617 identifies a block of numbers in Boston, MA, within the 617 area code. Every US prefix is tied to exactly one rate center; this one is Boston.
The rate center lies in the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area. The serving LATA is 128. Local time follows the Eastern zone.
Treat the on-screen number as a hint, not evidence — 617-617 can be spoofed like any US prefix. If a call feels off, verify through an official callback number and file a complaint with the FCC or FTC.
The assigned code holder is MASS MOBILE LLC, operating company number 125L, assigned March 18, 2025. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 617-614 | Newton | MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
| 617-615 | Milton | RCN TELECOM SERVICES, INC. - MA |
| 617-616 | Somerville | TC SYSTEMS, INC. |
| 617-618 | Newton | MCIMETRO ACCESS TRANSMISSION SERVICES LLC |
| 617-619 | Boston | VERIZON NEW ENGLAND INC. |
| 617-620 | Boston | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA |
FAQ
Where is 617-617 located?
The prefix is assigned to the Boston rate center in MA, area code 617. It is part of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area.
Which company owns 617-617 numbers?
MASS MOBILE LLC holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 617-617 safe to answer?
The prefix itself says nothing about the caller. Legitimate Boston businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.