PORTLAVACA prefixes in area code 361
NANPA records 11 assigned NXX blocks to rate center PORTLAVACA in area code 361, 2.0% of the 538 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. 6 holders hold those blocks, the largest being FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (4), NEW CINGULAR WIRELESS PCS, LLC - IL (3), TWILIO INTERNATIONAL, INC. (1). The earliest assignment on record here is 2001-05-14 and the most recent 2025-05-14. 9 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 |
|---|---|---|---|---|
| 361-250 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | 2009-02-19 | yes | yes |
| 361-335 | Twilio TWILIO INTERNATIONAL, INC. | 2024-10-29 | yes | yes |
| 361-365 | Onvoy ONVOY, LLC - TX | 2025-05-14 | yes | yes |
| 361-482 | STPCS JOINT VENTURE, LLC | 2001-09-27 | yes | yes |
| 361-487 | Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | 2001-05-14 | yes | yes |
| 361-551 | Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | – | yes | yes |
| 361-552 | Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | – | no | yes |
| 361-553 | Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | – | yes | yes |
| 361-746 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | yes | yes |
| 361-901 | Charter ONVOY SPECTRUM, LLC | 2021-03-19 | yes | yes |
| 361-920 | AT&T NEW CINGULAR WIRELESS PCS, LLC - IL | – | 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 |
|---|---|---|---|
| FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS | Frontier | 4 | 36.4% |
| NEW CINGULAR WIRELESS PCS, LLC - IL | AT&T | 3 | 27.3% |
| TWILIO INTERNATIONAL, INC. | Twilio | 1 | 9.1% |
| ONVOY, LLC - TX | Onvoy | 1 | 9.1% |
| STPCS JOINT VENTURE, LLC | – | 1 | 9.1% |
| ONVOY SPECTRUM, LLC | Charter | 1 | 9.1% |
Frequently asked
Which prefixes belong to PORTLAVACA in area code 361?
11 blocks: 250, 335, 365, 482, 487, 551, 552, 553, 746, 901, 920. The table above gives the holder of each.
Which carriers have numbers in PORTLAVACA?
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (4 blocks), NEW CINGULAR WIRELESS PCS, LLC - IL (3 blocks), TWILIO INTERNATIONAL, INC. (1 block), ONVOY, LLC - TX (1 block), STPCS JOINT VENTURE, LLC (1 block), ONVOY SPECTRUM, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is PORTLAVACA 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.