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

WHITEFISH prefixes in area code 406

NANPA records 4 assigned NXX blocks to rate center WHITEFISH in area code 406, 0.5% of the 754 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 CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK (2), LEVEL 3 COMMUNICATIONS, LLC - MT (1), CHARTER IP ENABLED SERVICES, LLC (1). The earliest assignment on record here is 2023-02-17 and the most recent 2023-02-17. 3 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 406
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
406-507 Lumen LEVEL 3 COMMUNICATIONS, LLC - MT 2023-02-17 yes yes
406-730 Charter CHARTER IP ENABLED SERVICES, LLC – yes yes
406-862 Lumen CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK – no yes
406-863 Lumen CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK – 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
CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK Lumen 2 50%
LEVEL 3 COMMUNICATIONS, LLC - MT Lumen 1 25%
CHARTER IP ENABLED SERVICES, LLC Charter 1 25%

Frequently asked

Which prefixes belong to WHITEFISH in area code 406?

4 blocks: 507, 730, 862, 863. The table above gives the holder of each.

Which carriers have numbers in WHITEFISH?

CENTURYTEL OF MONTANA, INC. DBA CENTURYLINK (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - MT (1 block), CHARTER IP ENABLED SERVICES, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is WHITEFISH 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 406

All 754 prefixes in 406