CMTN CMTN prefixes in area code 310
NANPA records 44 assigned NXX blocks to rate center CMTN CMTN in area code 310, 5.6% 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. 13 holders hold those blocks, the largest being PACIFIC BELL (26), ONVOY, LLC - CA (3), T-MOBILE USA, INC. (3). The earliest assignment on record here is 2012-10-09 and the most recent 2024-02-14. 18 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 424, 562 – 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 |
|---|---|---|---|---|
| 310-223 | AT&T PACIFIC BELL | – | no | yes |
| 310-361 | Onvoy ONVOY, LLC - CA | – | no | yes |
| 310-438 | T-Mobile T-MOBILE USA, INC. | – | yes | yes |
| 310-501 | Spok SPOK, INC. | – | no | yes |
| 310-509 | Spok SPOK, INC. | – | no | yes |
| 310-537 | AT&T PACIFIC BELL | – | no | yes |
| 310-554 | T-Mobile T-MOBILE USA, INC. | 2017-01-16 | yes | yes |
| 310-599 | 33 WIRELESS INC. | – | no | yes |
| 310-603 | AT&T PACIFIC BELL | – | no | yes |
| 310-604 | AT&T PACIFIC BELL | – | no | yes |
| 310-605 | AT&T PACIFIC BELL | – | no | yes |
| 310-608 | AT&T PACIFIC BELL | – | no | yes |
| 310-609 | AT&T PACIFIC BELL | – | no | yes |
| 310-627 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 2012-10-09 | yes | yes |
| 310-631 | AT&T PACIFIC BELL | – | no | yes |
| 310-632 | AT&T PACIFIC BELL | – | no | yes |
| 310-635 | AT&T PACIFIC BELL | – | no | yes |
| 310-637 | AT&T PACIFIC BELL | – | no | yes |
| 310-638 | AT&T PACIFIC BELL | – | no | yes |
| 310-639 | AT&T PACIFIC BELL | – | no | yes |
| 310-661 | AT&T PACIFIC BELL | – | yes | yes |
| 310-667 | Lumen LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | – | yes | yes |
| 310-668 | AT&T PACIFIC BELL | – | yes | yes |
| 310-669 | AT&T PACIFIC BELL | – | no | yes |
| 310-687 | AT&T PACIFIC BELL | – | no | yes |
| 310-705 | UTILITY TELECOM GROUP, LLC - CA | – | yes | yes |
| 310-735 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | – | yes | yes |
| 310-742 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 310-747 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | – | yes | yes |
| 310-757 | T-Mobile T-MOBILE USA, INC. | 2024-02-14 | yes | yes |
| 310-761 | AT&T PACIFIC BELL | – | no | yes |
| 310-762 | AT&T PACIFIC BELL | – | no | yes |
| 310-763 | AT&T PACIFIC BELL | – | no | yes |
| 310-764 | AT&T PACIFIC BELL | – | no | yes |
| 310-810 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2020-10-13 | yes | yes |
| 310-868 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 310-884 | AT&T PACIFIC BELL | – | no | yes |
| 310-885 | AT&T PACIFIC BELL | – | no | yes |
| 310-886 | AT&T PACIFIC BELL | – | yes | yes |
| 310-894 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | – | yes | yes |
| 310-898 | AT&T PACIFIC BELL | – | no | yes |
| 310-900 | AT&T PACIFIC BELL | – | yes | yes |
| 310-928 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 310-933 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | 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 | 26 | 59.1% |
| ONVOY, LLC - CA | Onvoy | 3 | 6.8% |
| T-MOBILE USA, INC. | T-Mobile | 3 | 6.8% |
| SPOK, INC. | Spok | 2 | 4.5% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Verizon | 2 | 4.5% |
| 33 WIRELESS INC. | – | 1 | 2.3% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | Peerless | 1 | 2.3% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | Lumen | 1 | 2.3% |
| UTILITY TELECOM GROUP, LLC - CA | – | 1 | 2.3% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 1 | 2.3% |
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 1 | 2.3% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 1 | 2.3% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 1 | 2.3% |
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 CMTN CMTN in area code 310?
44 blocks: 223, 361, 438, 501, 509, 537, 554, 599, 603, 604, 605, 608 and 32 more, all listed in the table above.
Which carriers have numbers in CMTN CMTN?
PACIFIC BELL (26 blocks), ONVOY, LLC - CA (3 blocks), T-MOBILE USA, INC. (3 blocks), SPOK, INC. (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (2 blocks), 33 WIRELESS INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is CMTN CMTN 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.