ONVOY, LLC - MT
43 prefixes in 406 · initial assignments from the NANPA CO code file, 09/17/2026
| NPA-NXX | Rate center | OCN | Assigned | Pooled |
|---|---|---|---|---|
| 406-221 | BUTTE | 453F | 2003-02-13 | Yes |
| 406-272 | BILLINGS | 453F | — | Yes |
| 406-290 | COLUMBUS | 453F | 2007-03-14 | Yes |
| 406-302 | WOLF CREEK | 453F | 2011-10-03 | Yes |
| 406-306 | MANHATTAN | 453F | 2017-10-20 | Yes |
| 406-313 | BOULDER | 453F | 2012-11-16 | Yes |
| 406-316 | BOULDER | 453F | 2019-07-12 | Yes |
| 406-318 | BILLINGS | 453F | 2011-02-17 | Yes |
| 406-341 | MANHATTAN | 453F | 2020-07-06 | Yes |
| 406-403 | GREATFALLS | 453F | 2006-03-08 | Yes |
| 406-405 | LIBBY | 453F | 2022-09-08 | Yes |
| 406-412 | BILLINGS | 453F | 2017-05-22 | Yes |
| 406-416 | FORSYTH | 453F | 2020-06-17 | Yes |
| 406-418 | COOKE CITY | 453F | 2019-08-20 | Yes |
| 406-419 | VICTOR | 453F | 2019-07-12 | Yes |
| 406-430 | HELENA | 453F | — | Yes |
| 406-501 | WHITEHALL | 453F | 2019-08-20 | Yes |
| 406-510 | MISSOULA | 453F | 2017-03-22 | Yes |
| 406-518 | GALATNGTWY | 453F | 2011-09-27 | Yes |
| 406-540 | MISSOULA | 453F | — | Yes |
| 406-577 | BOZEMAN | 453F | — | Yes |
| 406-612 | SWAN LAKE | 453F | 2007-10-11 | Yes |
| 406-614 | BIGFORK | 453F | 2020-10-13 | Yes |
| 406-616 | THREEFORKS | 453F | 2011-07-01 | Yes |
| 406-629 | HARDIN | 453F | — | Yes |
| 406-631 | ELMO | 453F | 2007-07-26 | Yes |
| 406-634 | HELENA | 453F | — | Yes |
| 406-643 | NO PARKMAN | 453F | 2007-05-24 | Yes |
| 406-645 | DEER LODGE | 453F | — | Yes |
| 406-692 | YELLOW BAY | 453F | 2007-10-11 | Yes |
| 406-792 | BUTTE | 453F | — | Yes |
| 406-794 | BILLINGS | 453F | 2006-03-15 | Yes |
| 406-800 | BRIDGER | 453F | 2013-12-11 | Yes |
| 406-804 | GARDINER | 453F | 2019-08-20 | Yes |
| 406-807 | EGLACIERPK | 453F | 2021-04-22 | Yes |
| 406-812 | LAUREL | 453F | 2011-10-03 | Yes |
| 406-820 | OLNEY | 453F | 2007-10-11 | Yes |
| 406-836 | GREATFALLS | 453F | — | Yes |
| 406-840 | SILVERTIP | 453F | 2007-05-23 | Yes |
| 406-905 | JOLIET | 453F | 2011-10-03 | Yes |
| 406-929 | HUNGRYHORS | 453F | 2007-07-26 | Yes |
| 406-991 | MARION | 453F | 2007-10-11 | Yes |
| 406-992 | HELENA | 453F | 2008-08-26 | 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.