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

ROXBURY prefixes in area code 857

NANPA records 20 assigned NXX blocks to rate center ROXBURY in area code 857, 5.5% of the 361 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. 7 holders hold those blocks, the largest being OMNIPOINT MIAMI E LICENSE, LLC (12), COMMIO, LLC (2), NEW CINGULAR WIRELESS PCS, LLC - DC (2). The earliest assignment on record here is 2001-06-29 and the most recent 2024-11-01. 20 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 607, 617, 785 – overlay codes cover the same geography, so a rate center is served by all of them.

20 assigned blocks – 5.5% of 857
7 holders of record
20 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
857-230 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2009-04-15 yes yes
857-269 Peerless PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 2013-04-24 yes yes
857-308 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2014-09-16 yes yes
857-339 COMMIO, LLC 2024-02-09 yes yes
857-351 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2024-05-17 yes yes
857-379 COMMIO, LLC 2021-07-28 yes yes
857-395 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2022-01-27 yes yes
857-397 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2022-07-28 yes yes
857-398 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2022-09-21 yes yes
857-399 Bandwidth BANDWIDTH.COM CLEC, LLC - MA 2001-06-29 yes yes
857-407 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2015-06-01 yes yes
857-424 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2016-10-25 yes yes
857-429 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2024-11-01 yes yes
857-437 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2019-09-12 yes yes
857-492 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2002-07-30 yes yes
857-506 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2023-10-06 yes yes
857-544 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2001-11-28 yes yes
857-675 Onvoy ONVOY, LLC - MA 2021-04-02 yes yes
857-693 TON80 COMMUNICATIONS, LLC 2022-02-15 yes yes
857-701 T-Mobile OMNIPOINT MIAMI E LICENSE, LLC 2014-01-15 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
OMNIPOINT MIAMI E LICENSE, LLC T-Mobile 12 60%
COMMIO, LLC – 2 10%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 2 10%
PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA Peerless 1 5%
BANDWIDTH.COM CLEC, LLC - MA Bandwidth 1 5%
ONVOY, LLC - MA Onvoy 1 5%
TON80 COMMUNICATIONS, LLC – 1 5%

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 ROXBURY in area code 857?

20 blocks: 230, 269, 308, 339, 351, 379, 395, 397, 398, 399, 407, 424 and 8 more, all listed in the table above.

Which carriers have numbers in ROXBURY?

OMNIPOINT MIAMI E LICENSE, LLC (12 blocks), COMMIO, LLC (2 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (2 blocks), PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA (1 block), BANDWIDTH.COM CLEC, LLC - MA (1 block), ONVOY, 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 ROXBURY 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 857

All 361 prefixes in 857