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

DUNSMUIR prefixes in area code 530

NANPA records 3 assigned NXX blocks to rate center DUNSMUIR in area code 530, 0.4% of the 782 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 PACIFIC BELL (1), SNOWCREST TELEPHONE, INC -CA (1), LEVEL 3 COMMUNICATIONS, LLC - CA (1). The earliest assignment on record here is 2011-03-28 and the most recent 2011-03-28. 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 530
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
530-235 AT&T PACIFIC BELL – yes yes
530-500 SNOWCREST TELEPHONE, INC -CA 2011-03-28 yes yes
530-678 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
PACIFIC BELL AT&T 1 33.3%
SNOWCREST TELEPHONE, INC -CA – 1 33.3%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 33.3%

Frequently asked

Which prefixes belong to DUNSMUIR in area code 530?

3 blocks: 235, 500, 678. The table above gives the holder of each.

Which carriers have numbers in DUNSMUIR?

PACIFIC BELL (1 block), SNOWCREST TELEPHONE, INC -CA (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 DUNSMUIR 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 530

All 782 prefixes in 530