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

COBB MT prefixes in area code 707

NANPA records 4 assigned NXX blocks to rate center COBB MT in area code 707, 0.5% 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. 3 holders hold those blocks, the largest being ONVOY, LLC - CA (2), PACIFIC BELL (1), LEVEL 3 COMMUNICATIONS, LLC - CA (1). The earliest assignment on record here is 2016-03-11 and the most recent 2016-03-11. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.5% of 707
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
707-715 Onvoy ONVOY, LLC - CA 2016-03-11 yes yes
707-881 Onvoy ONVOY, LLC - CA – yes yes
707-928 AT&T PACIFIC BELL – yes yes
707-929 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
ONVOY, LLC - CA Onvoy 2 50%
PACIFIC BELL AT&T 1 25%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 25%

Frequently asked

Which prefixes belong to COBB MT in area code 707?

4 blocks: 715, 881, 928, 929. The table above gives the holder of each.

Which carriers have numbers in COBB MT?

ONVOY, LLC - CA (2 blocks), PACIFIC BELL (1 block), LEVEL 3 COMMUNICATIONS, 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 COBB MT 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 707

All 785 prefixes in 707