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

WARREN prefixes in area code 401

NANPA records 13 assigned NXX blocks to rate center WARREN in area code 401, 2.2% of the 581 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. 10 holders hold those blocks, the largest being VERIZON NEW ENGLAND INC. (3), PAETEC ITEL, LLC (2), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (1). The earliest assignment on record here is 2001-03-28 and the most recent 2002-10-23. 11 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 207, 208, 218, 234 – overlay codes cover the same geography, so a rate center is served by all of them.

13 assigned blocks – 2.2% of 401
10 holders of record
11 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
401-237 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA – yes yes
401-245 Verizon VERIZON NEW ENGLAND INC. – no yes
401-246 Verizon VERIZON NEW ENGLAND INC. – yes yes
401-247 Verizon VERIZON NEW ENGLAND INC. – yes yes
401-252 T-Mobile METROPCS, INC. 2002-10-23 yes yes
401-289 Comcast COMCAST IP PHONE, LLC – yes yes
401-303 Charter ONVOY SPECTRUM, LLC – yes yes
401-310 Bandwidth BANDWIDTH.COM CLEC, LLC - RI – yes yes
401-337 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC – yes yes
401-561 Onvoy ONVOY, LLC - RI – no yes
401-628 Windstream PAETEC ITEL, LLC – yes yes
401-694 Windstream PAETEC ITEL, LLC 2001-03-28 yes yes
401-903 Lumen LEVEL 3 COMMUNICATIONS, LLC - RI – 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 3 23.1%
PAETEC ITEL, LLC Windstream 2 15.4%
TELEPORT COMMUNICATIONS AMERICA, LLC - CA AT&T 1 7.7%
METROPCS, INC. T-Mobile 1 7.7%
COMCAST IP PHONE, LLC Comcast 1 7.7%
ONVOY SPECTRUM, LLC Charter 1 7.7%
BANDWIDTH.COM CLEC, LLC - RI Bandwidth 1 7.7%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 7.7%
ONVOY, LLC - RI Onvoy 1 7.7%
LEVEL 3 COMMUNICATIONS, LLC - RI Lumen 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 WARREN in area code 401?

13 blocks: 237, 245, 246, 247, 252, 289, 303, 310, 337, 561, 628, 694 and 1 more, all listed in the table above.

Which carriers have numbers in WARREN?

VERIZON NEW ENGLAND INC. (3 blocks), PAETEC ITEL, LLC (2 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (1 block), METROPCS, INC. (1 block), COMCAST IP PHONE, LLC (1 block), ONVOY SPECTRUM, 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 WARREN 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 401

All 581 prefixes in 401