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

SANGABRIEL prefixes in area code 737

NANPA records 3 assigned NXX blocks to rate center SANGABRIEL in area code 737, 0.9% of the 333 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. 3 holders hold those blocks, the largest being BANDWIDTH.COM CLEC, LLC - TX (1), FIVE9, INC. (1), ONVOY, LLC - TX (1). The earliest assignment on record here is 2019-05-02 and the most recent 2024-10-07. 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 code 512 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.9% of 737
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
737-257 Bandwidth BANDWIDTH.COM CLEC, LLC - TX 2019-05-02 yes yes
737-364 FIVE9, INC. 2024-10-07 yes yes
737-473 Onvoy ONVOY, LLC - TX 2020-12-28 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 1 33.3%
FIVE9, INC. – 1 33.3%
ONVOY, LLC - TX Onvoy 1 33.3%

Frequently asked

Which prefixes belong to SANGABRIEL in area code 737?

3 blocks: 257, 364, 473. The table above gives the holder of each.

Which carriers have numbers in SANGABRIEL?

BANDWIDTH.COM CLEC, LLC - TX (1 block), FIVE9, INC. (1 block), ONVOY, LLC - TX (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is SANGABRIEL 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 737

All 333 prefixes in 737