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

CRESTLINE prefixes in area code 909

NANPA records 7 assigned NXX blocks to rate center CRESTLINE in area code 909, 0.9% 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. 6 holders hold those blocks, the largest being ONVOY, LLC - CA (2), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1), FRONTIER CALIFORNIA INC. (1). The earliest assignment on record here is 2007-04-22 and the most recent 2019-02-06. 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 codes 419, 567, 620, 840 – overlay codes cover the same geography, so a rate center is served by all of them.

7 assigned blocks – 0.9% of 909
6 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
909-245 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2007-04-22 yes yes
909-338 Frontier FRONTIER CALIFORNIA INC. – no yes
909-487 TPx U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 2013-10-24 yes yes
909-589 T-Mobile T-MOBILE USA, INC. – yes yes
909-698 Onvoy ONVOY, LLC - CA 2016-10-10 yes yes
909-715 Bandwidth BANDWIDTH.COM CLEC, LLC - CA 2019-02-06 yes yes
909-897 Onvoy ONVOY, 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
ONVOY, LLC - CA Onvoy 2 28.6%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 14.3%
FRONTIER CALIFORNIA INC. Frontier 1 14.3%
U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS TPx 1 14.3%
T-MOBILE USA, INC. T-Mobile 1 14.3%
BANDWIDTH.COM CLEC, LLC - CA Bandwidth 1 14.3%

Frequently asked

Which prefixes belong to CRESTLINE in area code 909?

7 blocks: 245, 338, 487, 589, 698, 715, 897. The table above gives the holder of each.

Which carriers have numbers in CRESTLINE?

ONVOY, LLC - CA (2 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block), FRONTIER CALIFORNIA INC. (1 block), U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS (1 block), T-MOBILE USA, INC. (1 block), BANDWIDTH.COM CLEC, 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 CRESTLINE 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 909

All 786 prefixes in 909