NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

THREERIVRS prefixes in area code 361

NANPA records 5 assigned NXX blocks to rate center THREERIVRS in area code 361, 0.9% 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. 5 holders hold those blocks, the largest being TELNYX LLC (1), ONVOY, LLC - TX (1), NEW CINGULAR WIRELESS PCS, LLC - IL (1). The earliest assignment on record here is 2012-03-21 and the most recent 2012-03-21. 3 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 codes 269, 559 – overlay codes cover the same geography, so a rate center is served by all of them.

5 assigned blocks – 0.9% of 361
5 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
361-272 Telnyx TELNYX LLC – yes yes
361-316 Onvoy ONVOY, LLC - TX – no yes
361-436 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes yes
361-784 VTX COMMUNICATIONS, LLC 2012-03-21 no yes
361-786 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – 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

HolderBrandBlocksShare here
TELNYX LLC Telnyx 1 20%
ONVOY, LLC - TX Onvoy 1 20%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 20%
VTX COMMUNICATIONS, LLC – 1 20%
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS Frontier 1 20%

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 THREERIVRS in area code 361?

5 blocks: 272, 316, 436, 784, 786. The table above gives the holder of each.

Which carriers have numbers in THREERIVRS?

TELNYX LLC (1 block), ONVOY, LLC - TX (1 block), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block), VTX COMMUNICATIONS, LLC (1 block), FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is THREERIVRS 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.

Other rate centers in 361

All 538 prefixes in 361