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

DONNA prefixes in area code 956

NANPA records 10 assigned NXX blocks to rate center DONNA in area code 956, 1.4% 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 BANDWIDTH.COM CLEC, LLC - TX (4), SOUTHWESTERN BELL (2), AT&T ENTERPRISES, LLC (1). The earliest assignment on record here is 2010-09-17 and the most recent 2024-12-05. 9 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

10 assigned blocks – 1.4% of 956
6 holders of record
9 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
956-274 AT&T AT&T ENTERPRISES, LLC 2010-09-17 yes yes
956-377 Lumen LEVEL 3 COMMUNICATIONS, LLC - TX – yes yes
956-420 Onvoy ONVOY, LLC - TX 2017-04-19 yes yes
956-461 AT&T SOUTHWESTERN BELL – yes yes
956-464 AT&T SOUTHWESTERN BELL – no yes
956-503 T-Mobile METROPCS, INC. 2014-06-16 yes yes
956-597 Bandwidth BANDWIDTH.COM CLEC, LLC - TX 2020-10-19 yes yes
956-646 Bandwidth BANDWIDTH.COM CLEC, LLC - TX 2021-11-02 yes yes
956-807 Bandwidth BANDWIDTH.COM CLEC, LLC - TX 2023-10-10 yes yes
956-823 Bandwidth BANDWIDTH.COM CLEC, LLC - TX 2024-12-05 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
BANDWIDTH.COM CLEC, LLC - TX Bandwidth 4 40%
SOUTHWESTERN BELL AT&T 2 20%
AT&T ENTERPRISES, LLC AT&T 1 10%
LEVEL 3 COMMUNICATIONS, LLC - TX Lumen 1 10%
ONVOY, LLC - TX Onvoy 1 10%
METROPCS, INC. T-Mobile 1 10%

Frequently asked

Which prefixes belong to DONNA in area code 956?

10 blocks: 274, 377, 420, 461, 464, 503, 597, 646, 807, 823. The table above gives the holder of each.

Which carriers have numbers in DONNA?

BANDWIDTH.COM CLEC, LLC - TX (4 blocks), SOUTHWESTERN BELL (2 blocks), AT&T ENTERPRISES, LLC (1 block), LEVEL 3 COMMUNICATIONS, LLC - TX (1 block), ONVOY, LLC - TX (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 DONNA 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