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

BIG BUTTE prefixes in area code 661

NANPA records 6 assigned NXX blocks to rate center BIG BUTTE in area code 661, 0.9% of the 674 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. 4 holders hold those blocks, the largest being BANDWIDTH.COM CLEC, LLC - CA (3), PACIFIC BELL (1), ONVOY, LLC - CA (1). The earliest assignment on record here is 2019-07-02 and the most recent 2021-09-22. 6 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

6 assigned blocks – 0.9% of 661
4 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
661-249 Bandwidth BANDWIDTH.COM CLEC, LLC - CA – yes yes
661-261 AT&T PACIFIC BELL – yes yes
661-462 Onvoy ONVOY, LLC - CA – yes yes
661-532 IP HORIZON LLC – yes yes
661-550 Bandwidth BANDWIDTH.COM CLEC, LLC - CA 2021-09-22 yes yes
661-669 Bandwidth BANDWIDTH.COM CLEC, LLC - CA 2019-07-02 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
BANDWIDTH.COM CLEC, LLC - CA Bandwidth 3 50%
PACIFIC BELL AT&T 1 16.7%
ONVOY, LLC - CA Onvoy 1 16.7%
IP HORIZON LLC – 1 16.7%

Frequently asked

Which prefixes belong to BIG BUTTE in area code 661?

6 blocks: 249, 261, 462, 532, 550, 669. The table above gives the holder of each.

Which carriers have numbers in BIG BUTTE?

BANDWIDTH.COM CLEC, LLC - CA (3 blocks), PACIFIC BELL (1 block), ONVOY, LLC - CA (1 block), IP HORIZON 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 BIG BUTTE 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 661

All 674 prefixes in 661