MARTINEZ prefixes in area code 925
NANPA records 22 assigned NXX blocks to rate center MARTINEZ in area code 925, 3.4% of the 640 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 PACIFIC BELL (7), LEVEL 3 COMMUNICATIONS, LLC - CA (3), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (2). The earliest assignment on record here is 2001-03-01 and the most recent 2026-05-08. 17 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 925-228 | AT&T PACIFIC BELL | – | no | yes |
| 925-229 | AT&T PACIFIC BELL | – | no | yes |
| 925-231 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | yes | yes |
| 925-269 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 925-293 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | – | yes | yes |
| 925-313 | AT&T PACIFIC BELL | – | no | yes |
| 925-316 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | yes | yes |
| 925-335 | AT&T PACIFIC BELL | – | yes | yes |
| 925-369 | MATRIX TELECOM, LLC. S/I/I TNCI - CA | – | yes | yes |
| 925-370 | AT&T PACIFIC BELL | – | no | yes |
| 925-372 | AT&T PACIFIC BELL | – | no | yes |
| 925-374 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 925-387 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | – | yes | yes |
| 925-500 | Onvoy ONVOY, LLC - CA | – | yes | yes |
| 925-514 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2023-10-06 | yes | yes |
| 925-608 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2001-03-01 | yes | yes |
| 925-638 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 2026-05-08 | yes | yes |
| 925-723 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | – | yes | yes |
| 925-812 | T-Mobile METROPCS, INC. | 2001-09-21 | yes | yes |
| 925-839 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 2001-04-24 | yes | yes |
| 925-917 | T-Mobile T-MOBILE USA, INC. | 2002-09-20 | yes | yes |
| 925-957 | AT&T PACIFIC BELL | – | 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 | 7 | 31.8% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 3 | 13.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 2 | 9.1% |
| MATRIX TELECOM, LLC. S/I/I TNCI - CA | – | 2 | 9.1% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 2 | 9.1% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 2 | 9.1% |
| ONVOY, LLC - CA | Onvoy | 1 | 4.5% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 1 | 4.5% |
| METROPCS, INC. | T-Mobile | 1 | 4.5% |
| T-MOBILE USA, INC. | T-Mobile | 1 | 4.5% |
Frequently asked
Which prefixes belong to MARTINEZ in area code 925?
22 blocks: 228, 229, 231, 269, 293, 313, 316, 335, 369, 370, 372, 374 and 10 more, all listed in the table above.
Which carriers have numbers in MARTINEZ?
PACIFIC BELL (7 blocks), LEVEL 3 COMMUNICATIONS, LLC - CA (3 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (2 blocks), MATRIX TELECOM, LLC. S/I/I TNCI - CA (2 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (2 blocks), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (2 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is MARTINEZ 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.