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

CLFRNHTSPG prefixes in area code 661

NANPA records 3 assigned NXX blocks to rate center CLFRNHTSPG 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. 2 holders hold those blocks, the largest being LEVEL 3 COMMUNICATIONS, LLC - CA (2), 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
2 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
661-453 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
661-548 Frontier FRONTIER CALIFORNIA INC. – yes yes
661-689 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – 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 2 66.7%
FRONTIER CALIFORNIA INC. Frontier 1 33.3%

Frequently asked

Which prefixes belong to CLFRNHTSPG in area code 661?

3 blocks: 453, 548, 689. The table above gives the holder of each.

Which carriers have numbers in CLFRNHTSPG?

LEVEL 3 COMMUNICATIONS, LLC - CA (2 blocks), 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 CLFRNHTSPG 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