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

INGLESIDE prefixes in area code 361

NANPA records 8 assigned NXX blocks to rate center INGLESIDE in area code 361, 1.5% 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 LEVEL 3 COMMUNICATIONS, LLC - TX (2), FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (2), ONVOY, LLC - TX (1). The earliest assignment on record here is 2001-09-27 and the most recent 2006-10-02. 6 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

8 assigned blocks – 1.5% of 361
6 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
361-238 Lumen LEVEL 3 COMMUNICATIONS, LLC - TX 2003-05-21 yes yes
361-273 Onvoy ONVOY, LLC - TX – no yes
361-345 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 2002-06-17 yes yes
361-385 STPCS JOINT VENTURE, LLC 2001-11-26 yes yes
361-523 T-Mobile METROPCS, INC. 2001-09-27 yes yes
361-775 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – yes yes
361-776 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – no yes
361-828 Lumen LEVEL 3 COMMUNICATIONS, LLC - TX 2006-10-02 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
LEVEL 3 COMMUNICATIONS, LLC - TX Lumen 2 25%
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS Frontier 2 25%
ONVOY, LLC - TX Onvoy 1 12.5%
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS TPx 1 12.5%
STPCS JOINT VENTURE, LLC – 1 12.5%
METROPCS, INC. T-Mobile 1 12.5%

Frequently asked

Which prefixes belong to INGLESIDE in area code 361?

8 blocks: 238, 273, 345, 385, 523, 775, 776, 828. The table above gives the holder of each.

Which carriers have numbers in INGLESIDE?

LEVEL 3 COMMUNICATIONS, LLC - TX (2 blocks), FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (2 blocks), ONVOY, LLC - TX (1 block), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block), STPCS JOINT VENTURE, LLC (1 block), METROPCS, INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is INGLESIDE 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