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

CHARLESTN prefixes in area code 617

NANPA records 13 assigned NXX blocks to rate center CHARLESTN in area code 617, 1.7% 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. 8 holders hold those blocks, the largest being MCIMETRO ACCESS TRANSMISSION SERVICES LLC (4), VERIZON NEW ENGLAND INC. (3), PAETEC ITEL, LLC (1). The earliest assignment on record here is 2001-02-16 and the most recent 2021-07-20. 9 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 603, 812, 857, 930 – overlay codes cover the same geography, so a rate center is served by all of them.

13 assigned blocks – 1.7% of 617
8 holders of record
9 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
617-241 Verizon VERIZON NEW ENGLAND INC. – no yes
617-242 Verizon VERIZON NEW ENGLAND INC. – no yes
617-286 Windstream PAETEC ITEL, LLC 2001-02-16 yes yes
617-337 RCN TELECOM SERVICES, INC. - MA – yes yes
617-380 Lumen LEVEL 3 COMMUNICATIONS, LLC - MA – yes yes
617-398 Bandwidth BANDWIDTH.COM CLEC, LLC - MA – yes yes
617-518 Onvoy ONVOY, LLC - MA 2021-07-20 yes yes
617-580 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
617-669 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC – no yes
617-681 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
617-712 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
617-886 Verizon VERIZON NEW ENGLAND INC. – no yes
617-952 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2001-03-08 yes 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.

Who holds the blocks

HolderBrandBlocksShare here
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 4 30.8%
VERIZON NEW ENGLAND INC. Verizon 3 23.1%
PAETEC ITEL, LLC Windstream 1 7.7%
RCN TELECOM SERVICES, INC. - MA – 1 7.7%
LEVEL 3 COMMUNICATIONS, LLC - MA Lumen 1 7.7%
BANDWIDTH.COM CLEC, LLC - MA Bandwidth 1 7.7%
ONVOY, LLC - MA Onvoy 1 7.7%
OMNIPOINT MIAMI E LICENSE, LLC T-Mobile 1 7.7%

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 CHARLESTN in area code 617?

13 blocks: 241, 242, 286, 337, 380, 398, 518, 580, 669, 681, 712, 886 and 1 more, all listed in the table above.

Which carriers have numbers in CHARLESTN?

MCIMETRO ACCESS TRANSMISSION SERVICES LLC (4 blocks), VERIZON NEW ENGLAND INC. (3 blocks), PAETEC ITEL, LLC (1 block), RCN TELECOM SERVICES, INC. - MA (1 block), LEVEL 3 COMMUNICATIONS, LLC - MA (1 block), BANDWIDTH.COM CLEC, LLC - MA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is CHARLESTN 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