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

CALISTOGA prefixes in area code 707

NANPA records 6 assigned NXX blocks to rate center CALISTOGA in area code 707, 0.8% of the 785 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 - CA (1), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (1), NEW CINGULAR WIRELESS PCS, LLC (1). The earliest assignment on record here is 2001-09-28 and the most recent 2017-11-29. 5 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

6 assigned blocks – 0.8% of 707
6 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-341 Bandwidth BANDWIDTH.COM CLEC, LLC - CA – yes yes
707-403 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CA 2007-06-21 yes yes
707-661 AT&T NEW CINGULAR WIRELESS PCS, LLC 2017-11-29 yes yes
707-709 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 2001-09-28 yes yes
707-737 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
707-942 AT&T PACIFIC BELL – no 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 1 16.7%
TELEPORT COMMUNICATIONS AMERICA, LLC - CA AT&T 1 16.7%
NEW CINGULAR WIRELESS PCS, LLC AT&T 1 16.7%
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS TPx 1 16.7%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 16.7%
PACIFIC BELL AT&T 1 16.7%

Frequently asked

Which prefixes belong to CALISTOGA in area code 707?

6 blocks: 341, 403, 661, 709, 737, 942. The table above gives the holder of each.

Which carriers have numbers in CALISTOGA?

BANDWIDTH.COM CLEC, LLC - CA (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - CA (1 block), NEW CINGULAR WIRELESS PCS, LLC (1 block), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block), LEVEL 3 COMMUNICATIONS, LLC - CA (1 block), PACIFIC BELL (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is CALISTOGA 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 707

All 785 prefixes in 707