BOULDER prefixes in area code 406
NANPA records 4 assigned NXX blocks to rate center BOULDER 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 ONVOY, LLC - MT (2), QWEST CORPORATION (1), LEVEL 3 COMMUNICATIONS, LLC - MT (1). The earliest assignment on record here is 2012-11-16 and the most recent 2023-02-22. 4 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 435 – overlay codes cover the same geography, so a rate center is served by all of them.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 406-225 | Lumen QWEST CORPORATION | – | yes | yes |
| 406-313 | Onvoy ONVOY, LLC - MT | 2012-11-16 | yes | yes |
| 406-316 | Onvoy ONVOY, LLC - MT | 2019-07-12 | yes | yes |
| 406-512 | Lumen LEVEL 3 COMMUNICATIONS, LLC - MT | 2023-02-22 | 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
| Holder | Brand | Blocks | Share here |
|---|---|---|---|
| ONVOY, LLC - MT | Onvoy | 2 | 50% |
| QWEST CORPORATION | Lumen | 1 | 25% |
| LEVEL 3 COMMUNICATIONS, LLC - MT | Lumen | 1 | 25% |
Frequently asked
Which prefixes belong to BOULDER in area code 406?
4 blocks: 225, 313, 316, 512. The table above gives the holder of each.
Which carriers have numbers in BOULDER?
ONVOY, LLC - MT (2 blocks), QWEST CORPORATION (1 block), LEVEL 3 COMMUNICATIONS, LLC - MT (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.
Is BOULDER 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.