MONTEREY prefixes in area code 831
NANPA records 64 assigned NXX blocks to rate center MONTEREY in area code 831, 15.8% of the 406 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. 28 holders hold those blocks, the largest being PACIFIC BELL (27), NEW CINGULAR WIRELESS PCS, LLC (4), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (3). The earliest assignment on record here is 2001-07-12 and the most recent 2026-05-20. 45 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 318, 540, 574, 931 – 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 |
|---|---|---|---|---|
| 831-200 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 2014-11-26 | yes | yes |
| 831-204 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 831-215 | HD CARRIER LLC | 2020-10-02 | yes | yes |
| 831-220 | Vonage VONAGE AMERICA LLC | 2018-05-31 | yes | yes |
| 831-224 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 831-230 | Telnyx TELNYX LLC | 2016-12-15 | yes | yes |
| 831-233 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | yes | yes |
| 831-236 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | no | yes |
| 831-241 | AT&T AT&T - LOCAL | – | yes | yes |
| 831-242 | AT&T PACIFIC BELL | – | yes | yes |
| 831-259 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 2022-06-10 | yes | yes |
| 831-264 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | – | yes | yes |
| 831-275 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2008-10-23 | yes | yes |
| 831-277 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | no | yes |
| 831-282 | IP HORIZON LLC | 2021-09-17 | yes | yes |
| 831-312 | CSC VOICE, LLC | 2024-03-26 | yes | yes |
| 831-317 | LEAP TELECOM, LLC | 2024-09-23 | yes | yes |
| 831-324 | Comcast COMCAST PHONE OF CALIFORNIA, LLC | – | yes | yes |
| 831-333 | AT&T PACIFIC BELL | – | yes | yes |
| 831-372 | AT&T PACIFIC BELL | – | no | yes |
| 831-373 | AT&T PACIFIC BELL | – | no | yes |
| 831-375 | AT&T PACIFIC BELL | – | no | yes |
| 831-383 | T-Mobile METROPCS, INC. | 2001-09-13 | yes | yes |
| 831-384 | AT&T PACIFIC BELL | – | no | yes |
| 831-392 | AT&T PACIFIC BELL | – | yes | yes |
| 831-393 | AT&T PACIFIC BELL | – | yes | yes |
| 831-394 | AT&T PACIFIC BELL | – | no | yes |
| 831-402 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2001-11-13 | yes | yes |
| 831-468 | EXIANT COMMUNICATIONS LLC | 2026-03-30 | yes | yes |
| 831-521 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 831-582 | AT&T PACIFIC BELL | – | yes | yes |
| 831-583 | AT&T PACIFIC BELL | – | yes | yes |
| 831-601 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | no | yes |
| 831-641 | AT&T PACIFIC BELL | – | yes | yes |
| 831-642 | AT&T PACIFIC BELL | – | no | yes |
| 831-643 | AT&T PACIFIC BELL | – | yes | yes |
| 831-644 | AT&T PACIFIC BELL | – | no | yes |
| 831-645 | AT&T PACIFIC BELL | – | no | yes |
| 831-646 | AT&T PACIFIC BELL | – | no | yes |
| 831-647 | AT&T PACIFIC BELL | – | no | yes |
| 831-648 | AT&T PACIFIC BELL | – | no | yes |
| 831-649 | AT&T PACIFIC BELL | – | yes | yes |
| 831-655 | AT&T PACIFIC BELL | – | no | yes |
| 831-656 | AT&T PACIFIC BELL | – | yes | yes |
| 831-657 | AT&T PACIFIC BELL | – | yes | yes |
| 831-658 | AT&T PACIFIC BELL | – | no | yes |
| 831-717 | Twilio TWILIO INTERNATIONAL, INC. | – | yes | yes |
| 831-718 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 2005-08-16 | yes | yes |
| 831-747 | AT&T AT&T ENTERPRISES, LLC | 2005-04-06 | yes | yes |
| 831-760 | T-Mobile METROPCS, INC. | – | yes | yes |
| 831-855 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | – | yes | yes |
| 831-867 | COMMIO, LLC | 2017-03-24 | yes | yes |
| 831-869 | T-Mobile METROPCS, INC. | 2001-07-12 | yes | yes |
| 831-880 | 8x8 8X8, INC. | 2026-05-20 | yes | yes |
| 831-881 | WIDE VOICE, LLC - CA | 2025-10-30 | yes | yes |
| 831-883 | AT&T PACIFIC BELL | – | yes | yes |
| 831-884 | AT&T PACIFIC BELL | – | yes | yes |
| 831-886 | NUSO, LLC | – | yes | yes |
| 831-887 | TERRA NOVA TELECOM INC. | – | yes | yes |
| 831-899 | AT&T PACIFIC BELL | – | no | yes |
| 831-901 | WAVENATION, LLC | – | yes | yes |
| 831-915 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 831-917 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | yes | yes |
| 831-920 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2005-06-03 | 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
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| PACIFIC BELL | AT&T | 27 | 42.2% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 4 | 6.2% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 3 | 4.7% |
| METROPCS, INC. | T-Mobile | 3 | 4.7% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | Peerless | 2 | 3.1% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 2 | 3.1% |
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 2 | 3.1% |
| ONVOY, LLC - CA | Onvoy | 1 | 1.6% |
| HD CARRIER LLC | – | 1 | 1.6% |
| VONAGE AMERICA LLC | Vonage | 1 | 1.6% |
| T-MOBILE USA, INC. | T-Mobile | 1 | 1.6% |
| TELNYX LLC | Telnyx | 1 | 1.6% |
| AT&T - LOCAL | AT&T | 1 | 1.6% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 1 | 1.6% |
| IP HORIZON LLC | – | 1 | 1.6% |
| CSC VOICE, LLC | – | 1 | 1.6% |
| LEAP TELECOM, LLC | – | 1 | 1.6% |
| COMCAST PHONE OF CALIFORNIA, LLC | Comcast | 1 | 1.6% |
| EXIANT COMMUNICATIONS LLC | – | 1 | 1.6% |
| TWILIO INTERNATIONAL, INC. | Twilio | 1 | 1.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Verizon | 1 | 1.6% |
| AT&T ENTERPRISES, LLC | AT&T | 1 | 1.6% |
| COMMIO, LLC | – | 1 | 1.6% |
| 8X8, INC. | 8x8 | 1 | 1.6% |
| WIDE VOICE, LLC - CA | – | 1 | 1.6% |
| NUSO, LLC | – | 1 | 1.6% |
| TERRA NOVA TELECOM INC. | – | 1 | 1.6% |
| WAVENATION, LLC | – | 1 | 1.6% |
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 MONTEREY in area code 831?
64 blocks: 200, 204, 215, 220, 224, 230, 233, 236, 241, 242, 259, 264 and 52 more, all listed in the table above.
Which carriers have numbers in MONTEREY?
PACIFIC BELL (27 blocks), NEW CINGULAR WIRELESS PCS, LLC (4 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (3 blocks), METROPCS, INC. (3 blocks), PEERLESS NETWORK OF CALIFORNIA, LLC - CA (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - CA (2 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is MONTEREY 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.