GREENWICH prefixes in area code 401
NANPA records 16 assigned NXX blocks to rate center GREENWICH in area code 401, 2.8% 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. 9 holders hold those blocks, the largest being VERIZON NEW ENGLAND INC. (4), PAETEC ITEL, LLC (3), OMNIPOINT MIAMI E LICENSE, LLC (2). The earliest assignment on record here is 2001-10-08 and the most recent 2025-07-01. 12 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 203, 419, 475, 518 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 401-203 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | 2002-10-23 | yes | yes |
| 401-219 | T-Mobile OMNIPOINT MIAMI E LICENSE, LLC | – | yes | yes |
| 401-234 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 401-317 | Telnyx TELNYX LLC | 2016-12-02 | yes | yes |
| 401-336 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | – | yes | yes |
| 401-398 | Comcast COMCAST IP PHONE, LLC | – | yes | yes |
| 401-402 | Windstream PAETEC ITEL, LLC | 2001-10-08 | yes | yes |
| 401-471 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 401-541 | Verizon VERIZON NEW ENGLAND INC. | – | yes | yes |
| 401-542 | Lumen LEVEL 3 COMMUNICATIONS, LLC - RI | – | yes | yes |
| 401-557 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 2025-07-01 | yes | yes |
| 401-558 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 401-715 | Onvoy ONVOY, LLC - RI | – | no | yes |
| 401-884 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 401-885 | Verizon VERIZON NEW ENGLAND INC. | – | no | yes |
| 401-886 | Verizon VERIZON NEW ENGLAND INC. | – | 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.
Who holds the blocks
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| VERIZON NEW ENGLAND INC. | Verizon | 4 | 25% |
| PAETEC ITEL, LLC | Windstream | 3 | 18.8% |
| OMNIPOINT MIAMI E LICENSE, LLC | T-Mobile | 2 | 12.5% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 2 | 12.5% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 1 | 6.2% |
| TELNYX LLC | Telnyx | 1 | 6.2% |
| COMCAST IP PHONE, LLC | Comcast | 1 | 6.2% |
| LEVEL 3 COMMUNICATIONS, LLC - RI | Lumen | 1 | 6.2% |
| ONVOY, LLC - RI | Onvoy | 1 | 6.2% |
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 GREENWICH in area code 401?
16 blocks: 203, 219, 234, 317, 336, 398, 402, 471, 541, 542, 557, 558 and 4 more, all listed in the table above.
Which carriers have numbers in GREENWICH?
VERIZON NEW ENGLAND INC. (4 blocks), PAETEC ITEL, LLC (3 blocks), OMNIPOINT MIAMI E LICENSE, LLC (2 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block), TELNYX 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 GREENWICH 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.