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

BELMONT prefixes in area code 617

NANPA records 10 assigned NXX blocks to rate center BELMONT in area code 617, 1.3% 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. 5 holders hold those blocks, the largest being VERIZON NEW ENGLAND INC. (6), RCN TELECOM SERVICES, INC. - MA (1), LEVEL 3 COMMUNICATIONS, LLC - MA (1). 7 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 304, 585, 603, 608 – overlay codes cover the same geography, so a rate center is served by all of them.

10 assigned blocks – 1.3% of 617
5 holders of record
7 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
617-209 RCN TELECOM SERVICES, INC. - MA – yes yes
617-484 Verizon VERIZON NEW ENGLAND INC. – no yes
617-486 Verizon VERIZON NEW ENGLAND INC. – no yes
617-489 Verizon VERIZON NEW ENGLAND INC. – no yes
617-826 Lumen LEVEL 3 COMMUNICATIONS, LLC - MA – yes yes
617-855 Verizon VERIZON NEW ENGLAND INC. – yes yes
617-883 Verizon VERIZON NEW ENGLAND INC. – yes yes
617-932 AT&T TC SYSTEMS, INC. – yes yes
617-977 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
617-993 Verizon VERIZON NEW ENGLAND INC. – 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
VERIZON NEW ENGLAND INC. Verizon 6 60%
RCN TELECOM SERVICES, INC. - MA – 1 10%
LEVEL 3 COMMUNICATIONS, LLC - MA Lumen 1 10%
TC SYSTEMS, INC. AT&T 1 10%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 10%

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 BELMONT in area code 617?

10 blocks: 209, 484, 486, 489, 826, 855, 883, 932, 977, 993. The table above gives the holder of each.

Which carriers have numbers in BELMONT?

VERIZON NEW ENGLAND INC. (6 blocks), RCN TELECOM SERVICES, INC. - MA (1 block), LEVEL 3 COMMUNICATIONS, LLC - MA (1 block), TC SYSTEMS, INC. (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is BELMONT 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