Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records
MONTEBELLO prefixes in area code 323
NANPA records 110 assigned NXX blocks to rate center MONTEBELLO in area code 323, 14.0% of the 786 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. 17 holders hold those blocks, the largest being METROPCS NETWORKS, LLC (38), PACIFIC BELL (20), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (11). The earliest assignment on record here is 2001-04-16 and the most recent 2021-09-23. 86 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 213, 738 – overlay codes cover the same geography, so a rate center is served by all of them.
110 assigned blocks – 14% of 323
17 holders of record
86 of them pooled in 1,000-number lots
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 323-201 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | – | yes | yes |
| 323-213 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2006-11-21 | yes | yes |
| 323-215 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 323-216 | T-Mobile METROPCS NETWORKS, LLC | 2001-12-26 | yes | yes |
| 323-236 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2001-07-16 | no | yes |
| 323-246 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2006-08-13 | yes | yes |
| 323-248 | AT&T PACIFIC BELL | 2010-06-07 | yes | yes |
| 323-253 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-270 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-271 | AT&T PACIFIC BELL | – | yes | yes |
| 323-273 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-278 | AT&T PACIFIC BELL | – | no | yes |
| 323-281 | 33 WIRELESS INC. | – | no | yes |
| 323-303 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2006-11-28 | yes | yes |
| 323-313 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | yes | yes |
| 323-314 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 323-324 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 323-346 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | – | yes | yes |
| 323-353 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-358 | T-Mobile METROPCS NETWORKS, LLC | 2011-12-23 | yes | yes |
| 323-359 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-365 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 323-385 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-399 | T-Mobile METROPCS NETWORKS, LLC | 2007-02-13 | yes | yes |
| 323-400 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | yes | yes |
| 323-416 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 2012-04-16 | yes | yes |
| 323-427 | T-Mobile METROPCS NETWORKS, LLC | 2011-04-22 | yes | yes |
| 323-430 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2013-02-27 | yes | yes |
| 323-434 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2007-03-28 | yes | yes |
| 323-437 | T-Mobile METROPCS NETWORKS, LLC | 2012-11-21 | yes | yes |
| 323-439 | T-Mobile METROPCS NETWORKS, LLC | 2007-04-04 | yes | yes |
| 323-440 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 323-453 | T-Mobile METROPCS NETWORKS, LLC | 2013-01-14 | yes | yes |
| 323-458 | T-Mobile METROPCS NETWORKS, LLC | 2012-03-02 | yes | yes |
| 323-477 | T-Mobile METROPCS NETWORKS, LLC | 2012-07-13 | yes | yes |
| 323-479 | T-Mobile METROPCS NETWORKS, LLC | 2007-06-07 | yes | yes |
| 323-480 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2012-08-13 | yes | yes |
| 323-482 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2005-10-11 | yes | yes |
| 323-483 | T-Mobile METROPCS NETWORKS, LLC | 2012-10-01 | yes | yes |
| 323-485 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2006-03-08 | yes | yes |
| 323-490 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 2001-05-10 | yes | yes |
| 323-494 | T-Mobile METROPCS NETWORKS, LLC | 2007-06-07 | yes | yes |
| 323-500 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | yes | yes |
| 323-501 | T-Mobile METROPCS NETWORKS, LLC | 2007-06-07 | yes | yes |
| 323-506 | T-Mobile METROPCS NETWORKS, LLC | 2007-06-07 | yes | yes |
| 323-514 | T-Mobile METROPCS NETWORKS, LLC | 2001-04-23 | yes | yes |
| 323-516 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | – | yes | yes |
| 323-517 | Windstream PAETEC ITEL, LLC | – | yes | yes |
| 323-519 | T-Mobile T-MOBILE USA, INC. | 2007-07-03 | yes | yes |
| 323-530 | T-Mobile T-MOBILE USA, INC. | 2016-07-22 | yes | yes |
| 323-548 | T-Mobile METROPCS NETWORKS, LLC | 2014-09-22 | yes | yes |
| 323-558 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | – | yes | yes |
| 323-594 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2007-08-29 | yes | yes |
| 323-597 | T-Mobile T-MOBILE USA, INC. | 2014-10-17 | yes | yes |
| 323-598 | T-Mobile METROPCS NETWORKS, LLC | 2014-11-24 | yes | yes |
| 323-614 | T-Mobile METROPCS NETWORKS, LLC | 2007-09-24 | yes | yes |
| 323-621 | T-Mobile T-MOBILE USA, INC. | 2014-01-27 | yes | yes |
| 323-622 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 323-624 | NORTH COUNTY COMMUNICATION CORPORATION - CA | – | no | yes |
| 323-626 | NORTH COUNTY COMMUNICATION CORPORATION - CA | – | no | yes |
| 323-629 | T-Mobile METROPCS NETWORKS, LLC | 2007-09-24 | yes | yes |
| 323-631 | T-Mobile METROPCS NETWORKS, LLC | 2014-11-04 | yes | yes |
| 323-637 | T-Mobile METROPCS NETWORKS, LLC | 2005-11-10 | yes | yes |
| 323-659 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2021-09-23 | yes | yes |
| 323-670 | T-Mobile METROPCS NETWORKS, LLC | 2014-12-22 | yes | yes |
| 323-680 | T-Mobile METROPCS NETWORKS, LLC | 2007-09-24 | yes | yes |
| 323-691 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-693 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 323-695 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2007-09-28 | yes | yes |
| 323-697 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2001-04-16 | no | yes |
| 323-707 | T-Mobile METROPCS NETWORKS, LLC | 2001-06-26 | yes | yes |
| 323-712 | T-Mobile T-MOBILE USA, INC. | 2002-06-14 | yes | yes |
| 323-714 | T-Mobile T-MOBILE USA, INC. | 2013-07-15 | yes | yes |
| 323-715 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2001-08-22 | no | yes |
| 323-718 | T-Mobile METROPCS NETWORKS, LLC | 2006-03-02 | yes | yes |
| 323-720 | AT&T PACIFIC BELL | – | no | yes |
| 323-721 | AT&T PACIFIC BELL | – | no | yes |
| 323-722 | AT&T PACIFIC BELL | – | no | yes |
| 323-724 | AT&T PACIFIC BELL | – | no | yes |
| 323-725 | AT&T PACIFIC BELL | – | no | yes |
| 323-726 | AT&T PACIFIC BELL | – | no | yes |
| 323-727 | AT&T PACIFIC BELL | – | no | yes |
| 323-728 | AT&T PACIFIC BELL | – | no | yes |
| 323-742 | T-Mobile T-MOBILE USA, INC. | 2006-04-25 | yes | yes |
| 323-765 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2015-07-02 | yes | yes |
| 323-767 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | – | yes | yes |
| 323-787 | T-Mobile METROPCS NETWORKS, LLC | 2006-08-17 | yes | yes |
| 323-797 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2014-09-09 | yes | yes |
| 323-803 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 2001-05-10 | yes | yes |
| 323-816 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-827 | T-Mobile METROPCS NETWORKS, LLC | 2014-12-22 | yes | yes |
| 323-832 | AT&T PACIFIC BELL | – | yes | yes |
| 323-837 | AT&T PACIFIC BELL | – | yes | yes |
| 323-838 | AT&T PACIFIC BELL | – | no | yes |
| 323-853 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 2016-11-18 | yes | yes |
| 323-867 | T-Mobile METROPCS NETWORKS, LLC | – | yes | yes |
| 323-869 | AT&T PACIFIC BELL | – | no | yes |
| 323-884 | T-Mobile METROPCS NETWORKS, LLC | 2014-10-14 | yes | yes |
| 323-887 | AT&T PACIFIC BELL | – | no | yes |
| 323-888 | AT&T PACIFIC BELL | – | no | yes |
| 323-889 | AT&T PACIFIC BELL | – | yes | yes |
| 323-890 | AT&T PACIFIC BELL | – | yes | yes |
| 323-893 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2001-04-23 | no | yes |
| 323-895 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2008-03-28 | yes | yes |
| 323-914 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 2017-03-29 | yes | yes |
| 323-926 | T-Mobile T-MOBILE USA, INC. | 2015-02-09 | yes | yes |
| 323-945 | Lumen LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | – | yes | yes |
| 323-947 | AT&T PACIFIC BELL | – | yes | yes |
| 323-949 | T-Mobile T-MOBILE USA, INC. | 2019-03-19 | yes | yes |
| 323-972 | T-Mobile METROPCS NETWORKS, LLC | – | 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 |
|---|---|---|---|
| METROPCS NETWORKS, LLC | T-Mobile | 38 | 34.5% |
| PACIFIC BELL | AT&T | 20 | 18.2% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 11 | 10% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 11 | 10% |
| T-MOBILE USA, INC. | T-Mobile | 9 | 8.2% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 3 | 2.7% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 3 | 2.7% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 2 | 1.8% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | Peerless | 2 | 1.8% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Verizon | 2 | 1.8% |
| NORTH COUNTY COMMUNICATION CORPORATION - CA | – | 2 | 1.8% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 2 | 1.8% |
| 33 WIRELESS INC. | – | 1 | 0.9% |
| AMERICAN MESSAGING SERVICES, LLC | American Messaging | 1 | 0.9% |
| PAETEC ITEL, LLC | Windstream | 1 | 0.9% |
| ONVOY, LLC - CA | Onvoy | 1 | 0.9% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | Lumen | 1 | 0.9% |
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 MONTEBELLO in area code 323?
110 blocks: 201, 213, 215, 216, 236, 246, 248, 253, 270, 271, 273, 278 and 98 more, all listed in the table above.
Which carriers have numbers in MONTEBELLO?
METROPCS NETWORKS, LLC (38 blocks), PACIFIC BELL (20 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (11 blocks), NEW CINGULAR WIRELESS PCS, LLC (11 blocks), T-MOBILE USA, INC. (9 blocks), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (3 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is MONTEBELLO 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.