LIBBY prefixes in area code 406
NANPA records 6 assigned NXX blocks to rate center LIBBY in area code 406, 0.8% 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. 4 holders hold those blocks, the largest being ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER (2), NEW CINGULAR WIRELESS PCS, LLC (2), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (1). The earliest assignment on record here is 2004-05-10 and the most recent 2026-01-15. 6 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.
Prefixes assigned here
| Prefix | Holder of record | Assigned | Pooled | In service |
|---|---|---|---|---|
| 406-283 | Ziply Fiber ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER | – | yes | yes |
| 406-291 | Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | – | yes | yes |
| 406-293 | Ziply Fiber ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER | – | yes | yes |
| 406-334 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2004-05-10 | yes | yes |
| 406-405 | Onvoy ONVOY, LLC - MT | 2022-09-08 | yes | yes |
| 406-918 | AT&T NEW CINGULAR WIRELESS PCS, LLC | 2026-01-15 | 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 |
|---|---|---|---|
| ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER | Ziply Fiber | 2 | 33.3% |
| NEW CINGULAR WIRELESS PCS, LLC | AT&T | 2 | 33.3% |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | Verizon | 1 | 16.7% |
| ONVOY, LLC - MT | Onvoy | 1 | 16.7% |
Frequently asked
Which prefixes belong to LIBBY in area code 406?
6 blocks: 283, 291, 293, 334, 405, 918. The table above gives the holder of each.
Which carriers have numbers in LIBBY?
ZIPLY FIBER MONTANA, LLC DBA ZIPLY FIBER (2 blocks), NEW CINGULAR WIRELESS PCS, LLC (2 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT (1 block), ONVOY, 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 LIBBY 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.