EL SEGUNDO prefixes in area code 424
NANPA records 18 assigned NXX blocks to rate center EL SEGUNDO in area code 424, 3.9% of the 460 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 BANDWIDTH.COM CLEC, LLC - CA (3), T-MOBILE USA, INC. (2), PEERLESS NETWORK OF CALIFORNIA, LLC - CA (2). The earliest assignment on record here is 2007-02-24 and the most recent 2025-07-28. 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 code 310 – 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 |
|---|---|---|---|---|
| 424-217 | T-Mobile T-MOBILE USA, INC. | 2007-02-24 | yes | yes |
| 424-218 | TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 2007-03-08 | yes | yes |
| 424-220 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | – | yes | yes |
| 424-225 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2007-03-28 | yes | yes |
| 424-277 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2011-07-15 | yes | yes |
| 424-290 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2013-01-04 | yes | yes |
| 424-301 | Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 2015-02-12 | yes | yes |
| 424-321 | T-Mobile T-MOBILE USA, INC. | 2013-06-17 | yes | yes |
| 424-367 | Lumen LEVEL 3 COMMUNICATIONS, LLC - CA | 2014-09-19 | yes | yes |
| 424-397 | Peerless PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 2015-04-10 | yes | yes |
| 424-405 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2017-10-11 | yes | yes |
| 424-423 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 2016-12-27 | yes | yes |
| 424-499 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2019-05-01 | yes | yes |
| 424-502 | Bandwidth BANDWIDTH.COM CLEC, LLC - CA | 2019-02-05 | yes | yes |
| 424-544 | FRACTEL, LLC | 2022-01-21 | yes | yes |
| 424-557 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 2025-07-28 | yes | yes |
| 424-678 | AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 2021-05-03 | yes | yes |
| 424-850 | Charter ONVOY SPECTRUM, LLC | 2023-04-12 | 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 |
|---|---|---|---|
| BANDWIDTH.COM CLEC, LLC - CA | Bandwidth | 3 | 16.7% |
| T-MOBILE USA, INC. | T-Mobile | 2 | 11.1% |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | Peerless | 2 | 11.1% |
| LEVEL 3 COMMUNICATIONS, LLC - CA | Lumen | 2 | 11.1% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | Verizon | 2 | 11.1% |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | AT&T | 2 | 11.1% |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | TPx | 1 | 5.6% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 1 | 5.6% |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | Verizon | 1 | 5.6% |
| FRACTEL, LLC | – | 1 | 5.6% |
| ONVOY SPECTRUM, LLC | Charter | 1 | 5.6% |
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 424?
18 blocks: 217, 218, 220, 225, 277, 290, 301, 321, 367, 397, 405, 423 and 6 more, all listed in the table above.
Which carriers have numbers in EL SEGUNDO?
BANDWIDTH.COM CLEC, LLC - CA (3 blocks), T-MOBILE USA, INC. (2 blocks), PEERLESS NETWORK OF CALIFORNIA, LLC - CA (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - CA (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA (2 blocks), TELEPORT COMMUNICATIONS AMERICA, 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 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.