NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

DEDHAM prefixes in area code 617

NANPA records 4 assigned NXX blocks to rate center DEDHAM in area code 617, 0.5% of the 768 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 1 holder holds those blocks, the largest being NEW CINGULAR WIRELESS PCS, LLC - DC (4). The same rate center name also appears in area codes 339, 712, 781 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.5% of 617
1 holders of record
0 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
617-365 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
617-462 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
617-640 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
617-759 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to DEDHAM in area code 617?

4 blocks: 365, 462, 640, 759. The table above gives the holder of each.

Which carriers have numbers in DEDHAM?

NEW CINGULAR WIRELESS PCS, LLC - DC (4 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is DEDHAM a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 617

All 768 prefixes in 617