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

LOST HILLS prefixes in area code 661

NANPA records 3 assigned NXX blocks to rate center LOST HILLS in area code 661, 0.4% 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. 3 holders hold those blocks, the largest being LEVEL 3 COMMUNICATIONS, LLC - CA (1), TERRA NOVA TELECOM INC. (1), FRONTIER CALIFORNIA INC. (1). 3 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

3 assigned blocks – 0.4% of 661
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
661-214 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
661-457 TERRA NOVA TELECOM INC. – yes yes
661-797 Frontier FRONTIER CALIFORNIA INC. – 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 COMMUNICATIONS, LLC - CA Lumen 1 33.3%
TERRA NOVA TELECOM INC. – 1 33.3%
FRONTIER CALIFORNIA INC. Frontier 1 33.3%

Frequently asked

Which prefixes belong to LOST HILLS in area code 661?

3 blocks: 214, 457, 797. The table above gives the holder of each.

Which carriers have numbers in LOST HILLS?

LEVEL 3 COMMUNICATIONS, LLC - CA (1 block), TERRA NOVA TELECOM INC. (1 block), FRONTIER CALIFORNIA 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 LOST HILLS 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