Prefix 617-218 — Cambridge, MA

NANPA CO code assignment, current as of July 28, 2026.

The 617-218 prefix belongs to area code 617 and is anchored to the Cambridge rate center (MA). In NANP terms, the prefix — or NXX — determines the rate center a number is billed against.

Cambridge is part of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area. For routing purposes it sits in LATA 128. Numbers here keep Eastern time.

Code-holder of record: TC SYSTEMS, INC. (OCN 7135). The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 617-218 numbers may be served by different companies.

Caller ID showing 617-218 is not proof the call came from Cambridge: spoofing and porting both detach numbers from their origin. To verify a caller, hang up and dial the organization's published number, and report suspicious calls to the FTC.

Neighboring prefixes

FAQ

Where is 617-218 located?

The prefix is assigned to the Cambridge rate center in MA, area code 617. It is part of the Boston-Cambridge-Newton, MA-NH Metropolitan Statistical Area.

Which company owns 617-218 numbers?

TC SYSTEMS, INC. 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 617-218 safe to answer?

The prefix itself says nothing about the caller. Legitimate Cambridge businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.