LEVEL 3 COMMUNICATIONS, LLC - MT
27 prefixes in 406 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 406-203 | MISSOULA | 9415 | — | Yes |
| 406-204 | HELENA | 9415 | — | Yes |
| 406-205 | GREATFALLS | 9415 | — | Yes |
| 406-206 | BILLINGS | 9415 | — | — |
| 406-213 | COLSTRIP | 9415 | 2003-05-06 | Yes |
| 406-299 | BUTTE | 9415 | 2003-01-23 | Yes |
| 406-504 | FAIRFIELD | 9415 | 2021-02-12 | Yes |
| 406-507 | WHITEFISH | 9415 | 2023-02-17 | Yes |
| 406-508 | FRENCHTOWN | 9415 | 2012-02-03 | Yes |
| 406-512 | BOULDER | 9415 | 2023-02-22 | Yes |
| 406-530 | LAUREL | 9415 | — | Yes |
| 406-545 | BILLINGS | 9415 | 2002-06-19 | Yes |
| 406-551 | BOZEMAN | 9415 | 2002-06-19 | Yes |
| 406-552 | MISSOULA | 9415 | 2002-06-19 | Yes |
| 406-564 | GREATFALLS | 9415 | 2002-06-19 | Yes |
| 406-565 | BUTTE | 9415 | 2002-06-19 | Yes |
| 406-630 | SIDNEY | 9415 | 2005-02-16 | Yes |
| 406-900 | ENNIS | 9415 | 2017-09-29 | Yes |
| 406-902 | SHERIDAN | 9415 | 2018-11-27 | Yes |
| 406-924 | BELGRADE | 9415 | 2004-10-26 | Yes |
| 406-943 | SIDNEY | 9415 | 2003-01-09 | Yes |
| 406-944 | MILES CITY | 9415 | 2003-01-09 | Yes |
| 406-946 | LIVINGSTON | 9415 | 2003-01-09 | Yes |
| 406-948 | GLENDIVE | 9415 | 2003-01-09 | Yes |
| 406-960 | DILLON | 9415 | 2003-01-09 | Yes |
| 406-966 | SHELBY | 9415 | 2003-01-09 | Yes |
| 406-988 | DILLON | 9415 | 2005-01-07 | Yes |
These are initial assignees from NANPA CO-code records — because of number portability, the current serving carrier of individual numbers may differ. Bulk export requires a membership.