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

RIGRANDECY prefixes in area code 956

NANPA records 16 assigned NXX blocks to rate center RIGRANDECY in area code 956, 2.2% of the 735 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 NEW CINGULAR WIRELESS PCS, LLC - IL (4), METROPCS, INC. (4), FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (4). The earliest assignment on record here is 2001-05-24 and the most recent 2023-08-22. 14 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

16 assigned blocks – 2.2% of 956
6 holders of record
14 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
956-256 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2008-05-27 yes yes
956-257 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2011-05-27 yes yes
956-263 T-Mobile METROPCS, INC. 2003-02-11 yes yes
956-317 T-Mobile METROPCS, INC. 2009-11-16 yes yes
956-352 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL 2013-06-17 yes yes
956-370 Bandwidth BANDWIDTH.COM CLEC, LLC - TX 2017-01-18 yes yes
956-416 T-Mobile METROPCS, INC. 2014-12-19 yes yes
956-476 Onvoy ONVOY, LLC - TX 2019-07-25 yes yes
956-487 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – no yes
956-488 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – no yes
956-500 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes yes
956-573 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 2001-05-24 yes yes
956-696 Charter ONVOY SPECTRUM, LLC 2021-05-27 yes yes
956-716 Frontier FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS – yes yes
956-735 T-Mobile METROPCS, INC. 2002-10-02 yes yes
956-738 Onvoy ONVOY, LLC - TX 2023-08-22 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
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 4 25%
METROPCS, INC. T-Mobile 4 25%
FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS Frontier 4 25%
ONVOY, LLC - TX Onvoy 2 12.5%
BANDWIDTH.COM CLEC, LLC - TX Bandwidth 1 6.2%
ONVOY SPECTRUM, LLC Charter 1 6.2%

Frequently asked

Which prefixes belong to RIGRANDECY in area code 956?

16 blocks: 256, 257, 263, 317, 352, 370, 416, 476, 487, 488, 500, 573 and 4 more, all listed in the table above.

Which carriers have numbers in RIGRANDECY?

NEW CINGULAR WIRELESS PCS, LLC - IL (4 blocks), METROPCS, INC. (4 blocks), FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS (4 blocks), ONVOY, LLC - TX (2 blocks), BANDWIDTH.COM CLEC, LLC - TX (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 RIGRANDECY 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 956

All 735 prefixes in 956