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

FIREBAUGH prefixes in area code 559

NANPA records 6 assigned NXX blocks to rate center FIREBAUGH in area code 559, 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 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA (1), IP HORIZON LLC (1), ONVOY, LLC - CA (1). 6 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 357 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 559
6 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
559-296 Lumen LEVEL 3 TELECOM OF CALIFORNIA, LP - CA – yes yes
559-407 IP HORIZON LLC – yes yes
559-657 Onvoy ONVOY, LLC - CA – yes yes
559-659 AT&T PACIFIC BELL – yes yes
559-694 T-Mobile METROPCS, INC. – yes yes
559-933 TON80 COMMUNICATIONS, LLC – 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
LEVEL 3 TELECOM OF CALIFORNIA, LP - CA Lumen 1 16.7%
IP HORIZON LLC – 1 16.7%
ONVOY, LLC - CA Onvoy 1 16.7%
PACIFIC BELL AT&T 1 16.7%
METROPCS, INC. T-Mobile 1 16.7%
TON80 COMMUNICATIONS, LLC – 1 16.7%

Frequently asked

Which prefixes belong to FIREBAUGH in area code 559?

6 blocks: 296, 407, 657, 659, 694, 933. The table above gives the holder of each.

Which carriers have numbers in FIREBAUGH?

LEVEL 3 TELECOM OF CALIFORNIA, LP - CA (1 block), IP HORIZON LLC (1 block), ONVOY, LLC - CA (1 block), PACIFIC BELL (1 block), METROPCS, INC. (1 block), TON80 COMMUNICATIONS, 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 FIREBAUGH 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 559

All 785 prefixes in 559