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

MALIBU prefixes in area code 310

NANPA records 12 assigned NXX blocks to rate center MALIBU in area code 310, 1.5% of the 786 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. 7 holders hold those blocks, the largest being FRONTIER CALIFORNIA INC. (4), T-MOBILE USA, INC. (2), ONVOY, LLC - CA (2). The earliest assignment on record here is 2001-04-19 and the most recent 2023-06-26. 11 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 424 – overlay codes cover the same geography, so a rate center is served by all of them.

12 assigned blocks – 1.5% of 310
7 holders of record
11 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
310-317 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-359 T-Mobile T-MOBILE USA, INC. – yes yes
310-456 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-457 Frontier FRONTIER CALIFORNIA INC. – no yes
310-494 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
310-506 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS – yes yes
310-579 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA – yes yes
310-589 Frontier FRONTIER CALIFORNIA INC. – yes yes
310-708 Onvoy ONVOY, LLC - CA 2023-06-26 yes yes
310-774 T-Mobile T-MOBILE USA, INC. – yes yes
310-919 Onvoy ONVOY, LLC - CA – yes yes
310-924 T-Mobile METROPCS NETWORKS, LLC 2001-04-19 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
FRONTIER CALIFORNIA INC. Frontier 4 33.3%
T-MOBILE USA, INC. T-Mobile 2 16.7%
ONVOY, LLC - CA Onvoy 2 16.7%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 8.3%
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS TPx 1 8.3%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA Verizon 1 8.3%
METROPCS NETWORKS, LLC T-Mobile 1 8.3%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to MALIBU in area code 310?

12 blocks: 317, 359, 456, 457, 494, 506, 579, 589, 708, 774, 919, 924. The table above gives the holder of each.

Which carriers have numbers in MALIBU?

FRONTIER CALIFORNIA INC. (4 blocks), T-MOBILE USA, INC. (2 blocks), ONVOY, LLC - CA (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - CA (1 block), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MALIBU 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 310

All 786 prefixes in 310