EL SEGUNDO prefixes in area code 310
NANPA records 39 assigned NXX blocks to rate center EL SEGUNDO in area code 310, 5.0% 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. 11 holders hold those blocks, the largest being PACIFIC BELL (24), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (4), LEVEL 3 COMMUNICATIONS, LLC - CA (2). The earliest assignment on record here is 2001-05-03 and the most recent 2020-08-28. 22 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 code 424 – 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 |
|---|---|---|---|---|
| 310-227 | T-Mobile T-MOBILE USA, INC. | 2001-05-03 | yes | yes |
| 310-252 | AT&T PACIFIC BELL | – | no | yes |
| 310-321 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | – | yes | yes |
| 310-322 | AT&T PACIFIC BELL | – | no | yes |
| 310-333 | AT&T PACIFIC BELL | – | no | yes |
| 310-334 | AT&T PACIFIC BELL | – | yes | yes |
| 310-335 | AT&T PACIFIC BELL | – | no | yes |
| 310-336 | AT&T PACIFIC BELL | – | no | yes |
| 310-341 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | – | yes | yes |
| 310-343 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | – | yes | yes |
| 310-356 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | yes | yes |
| 310-364 | AT&T PACIFIC BELL | – | no | yes |
| 310-414 | AT&T PACIFIC BELL | – | yes | yes |
| 310-416 | AT&T PACIFIC BELL | – | no | yes |
| 310-426 | AT&T PACIFIC BELL | – | yes | yes |
| 310-469 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | – | yes | yes |
| 310-524 | AT&T PACIFIC BELL | – | no | yes |
| 310-529 | AT&T NEW CINGULAR WIRELESS PCS, LLC | – | no | yes |
| 310-535 | AT&T PACIFIC BELL | – | no | yes |
| 310-563 | AT&T PACIFIC BELL | – | no | yes |
| 310-565 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 2020-08-28 | yes | yes |
| 310-606 | AT&T PACIFIC BELL | – | yes | yes |
| 310-607 | AT&T PACIFIC BELL | – | no | yes |
| 310-615 | AT&T PACIFIC BELL | – | no | yes |
| 310-616 | AT&T PACIFIC BELL | – | yes | yes |
| 310-640 | AT&T PACIFIC BELL | – | no | yes |
| 310-647 | AT&T PACIFIC BELL | – | yes | yes |
| 310-648 | AT&T PACIFIC BELL | – | yes | yes |
| 310-653 | AT&T PACIFIC BELL | 2005-02-23 | yes | yes |
| 310-658 | Lumen LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | – | yes | yes |
| 310-662 | AT&T PACIFIC BELL | – | yes | yes |
| 310-726 | AT&T PACIFIC BELL | – | no | yes |
| 310-744 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | – | yes | yes |
| 310-760 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC | – | yes | yes |
| 310-765 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | – | yes | yes |
| 310-797 | American Messaging AMERICAN MESSAGING SERVICES, LLC | – | no | yes |
| 310-906 | IP HORIZON LLC | – | yes | yes |
| 310-955 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | – | yes | yes |
| 310-964 | AT&T PACIFIC BELL | – | 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 |
|---|---|---|---|
| PACIFIC BELL | AT&T | 24 | 61.5% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 4 | 10.3% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 2 | 5.1% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Verizon | 2 | 5.1% |
| T-MOBILE USA, INC. | T-Mobile | 1 | 2.6% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 1 | 2.6% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 1 | 2.6% |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | Lumen | 1 | 2.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | Verizon | 1 | 2.6% |
| AMERICAN MESSAGING SERVICES, LLC | American Messaging | 1 | 2.6% |
| IP HORIZON LLC | – | 1 | 2.6% |
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 EL SEGUNDO in area code 310?
39 blocks: 227, 252, 321, 322, 333, 334, 335, 336, 341, 343, 356, 364 and 27 more, all listed in the table above.
Which carriers have numbers in EL SEGUNDO?
PACIFIC BELL (24 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (4 blocks), LEVEL 3 COMMUNICATIONS, LLC - CA (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (2 blocks), T-MOBILE USA, INC. (1 block), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is EL SEGUNDO 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.