SILSBEE prefixes in area code 409
NANPA records 6 assigned NXX blocks to rate center SILSBEE in area code 409, 1.4% of the 434 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. 4 holders hold those blocks, the largest being ONVOY, LLC - TX (2), SOUTHWESTERN BELL (2), LEVEL 3 COMMUNICATIONS, LLC - TX (1). The earliest assignment on record here is 2021-01-08 and the most recent 2025-11-17. 6 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 |
|---|---|---|---|---|
| 409-262 | Onvoy ONVOY, LLC - TX | 2021-01-08 | yes | yes |
| 409-314 | Onvoy ONVOY, LLC - TX | 2023-08-15 | yes | yes |
| 409-373 | Lumen LEVEL 3 COMMUNICATIONS, LLC - TX | – | yes | yes |
| 409-385 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 409-386 | AT&T SOUTHWESTERN BELL | – | yes | yes |
| 409-587 | AHOI LLC | 2025-11-17 | 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 |
|---|---|---|---|
| ONVOY, LLC - TX | Onvoy | 2 | 33.3% |
| SOUTHWESTERN BELL | AT&T | 2 | 33.3% |
| LEVEL 3 COMMUNICATIONS, LLC - TX | Lumen | 1 | 16.7% |
| AHOI LLC | – | 1 | 16.7% |
Frequently asked
Which prefixes belong to SILSBEE in area code 409?
6 blocks: 262, 314, 373, 385, 386, 587. The table above gives the holder of each.
Which carriers have numbers in SILSBEE?
ONVOY, LLC - TX (2 blocks), SOUTHWESTERN BELL (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - TX (1 block), AHOI 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 SILSBEE 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.