CARLSBAD prefixes in area code 575
NANPA records 19 assigned NXX blocks to rate center CARLSBAD in area code 575, 3.6% of the 521 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. 8 holders hold those blocks, the largest being VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW (5), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM (4), T-MOBILE USA, INC. (3). The earliest assignment on record here is 2001-03-16 and the most recent 2025-03-11. 11 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 325 – 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 |
|---|---|---|---|---|
| 575-200 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | 2004-08-24 | yes | yes |
| 575-234 | Windstream VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | – | no | yes |
| 575-236 | Windstream VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | – | yes | yes |
| 575-237 | Onvoy ONVOY, LLC - NM | 2019-12-16 | yes | yes |
| 575-266 | T-Mobile T-MOBILE USA, INC. | 2021-04-26 | yes | yes |
| 575-302 | T-Mobile T-MOBILE USA, INC. | 2001-03-16 | yes | yes |
| 575-307 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2023-10-06 | yes | yes |
| 575-341 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | 2025-03-11 | yes | yes |
| 575-361 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | 2013-08-10 | no | yes |
| 575-499 | MESCALERO APACHE TELECOM, INC. - NM | 2005-12-12 | yes | yes |
| 575-628 | Windstream VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | – | no | yes |
| 575-689 | T-Mobile T-MOBILE USA, INC. | 2011-05-23 | yes | yes |
| 575-706 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2002-11-18 | no | yes |
| 575-725 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2008-04-17 | yes | yes |
| 575-817 | LEACO RURAL TELEPHONE COOPERATIVE, INC. DBA LEACO | – | no | yes |
| 575-885 | Windstream VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | – | no | yes |
| 575-887 | Windstream VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | – | no | yes |
| 575-941 | PVT NETWORKS, INC. - NM | 2008-09-17 | no | yes |
| 575-988 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | 2018-04-11 | 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 |
|---|---|---|---|
| VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW | Windstream | 5 | 26.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM | Verizon | 4 | 21.1% |
| T-MOBILE USA, INC. | T-Mobile | 3 | 15.8% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 3 | 15.8% |
| ONVOY, LLC - NM | Onvoy | 1 | 5.3% |
| MESCALERO APACHE TELECOM, INC. - NM | – | 1 | 5.3% |
| LEACO RURAL TELEPHONE COOPERATIVE, INC. DBA LEACO | – | 1 | 5.3% |
| PVT NETWORKS, INC. - NM | – | 1 | 5.3% |
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 CARLSBAD in area code 575?
19 blocks: 200, 234, 236, 237, 266, 302, 307, 341, 361, 499, 628, 689 and 7 more, all listed in the table above.
Which carriers have numbers in CARLSBAD?
VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW (5 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM (4 blocks), T-MOBILE USA, INC. (3 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (3 blocks), ONVOY, LLC - NM (1 block), MESCALERO APACHE TELECOM, INC. - NM (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is CARLSBAD 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.