Local Calling Guide
Area code/prefix search
NPA: 406
[Rate centres in NPA 406]
[Dial plan for NPA 406]
<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 >>
| NPA-NXX |
BLOCK |
Rate Centre |
Region |
Switch |
OCN |
LATA |
LIR |
Eff date |
Disc date |
| 406-505
| 3 |
Conrad |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-02-11 |
|
| 406-505
| 4 |
Conrad |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2019-09-15 |
|
| 406-505
| 5 |
Conrad |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2019-10-28 |
|
| 406-505
| 6 |
Conrad |
MT |
HLNAMTMAUMD |
508J CENTURYLINK COMMUNICATIONS, LLC |
648 |
|
2014-05-24 |
|
| 406-505
| 7 |
Conrad |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2011-10-21 |
|
| 406-505
| 8 |
Conrad |
MT |
GRFLMTMAKMD |
624H ONVOY SPECTRUM, LLC |
648 |
|
2021-07-18 |
|
| 406-505
| 9 |
Conrad |
MT |
GRFLMTMAKMD |
624H ONVOY SPECTRUM, LLC |
648 |
|
2021-11-14 |
|
| 406-506
| A |
Billings |
MT |
BLNGMT93BMD |
321J HD CARRIER LLC |
650 |
|
|
|
| 406-506
| 0 |
Billings |
MT |
BLNGMT93BMD |
994E BANDWIDTH.COM CLEC, LLC - MT |
650 |
|
2022-10-07 |
|
| 406-506
| 1 |
Billings |
MT |
BLNGMT93BMD |
321J HD CARRIER LLC |
650 |
|
2020-11-01 |
|
| 406-506
| 2 |
Billings |
MT |
BLNGMT93BMD |
321J HD CARRIER LLC |
650 |
|
2020-11-01 |
|
| 406-506
| 3 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2021-07-05 |
|
| 406-506
| 4 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-10-05 |
|
| 406-506
| 5 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-10-05 |
|
| 406-506
| 6 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2020-10-05 |
|
| 406-506
| 7 |
Billings |
MT |
BLNGMTAS9MD |
453F ONVOY, LLC - MT |
650 |
|
2021-07-05 |
|
| 406-506
| 8 |
Billings |
MT |
BLNGMTMAXMD |
6529 T-MOBILE USA, INC. |
650 |
|
2020-09-03 |
|
| 406-506
| 9 |
Billings |
MT |
BLNGMT93BMD |
321J HD CARRIER LLC |
650 |
|
2020-07-23 |
|
| 406-507
| A |
Whitefish |
MT |
MSSLMTMA0MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
648 |
|
|
|
| 406-507
| 0 |
Whitefish |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2024-04-14 |
|
| 406-507
| 1 |
Whitefish |
MT |
MSSLMTMA0MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
648 |
|
2023-04-21 |
|
| 406-508
| A |
Frenchtown |
MT |
MSSLMTMA0MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
648 |
|
|
|
| 406-508
| 0 |
Frenchtown |
MT |
GRFLMTMAHMD |
073H TELNYX LLC |
648 |
|
2020-08-13 |
|
| 406-508
| 1 |
Frenchtown |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2012-12-24 |
|
| 406-508
| 2 |
Frenchtown |
MT |
MSSLMTMA0MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
648 |
|
2012-04-01 |
|
| 406-508
| 3 |
Frenchtown |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-03-07 |
|
| 406-508
| 4 |
Frenchtown |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-03-07 |
|
| 406-508
| 5 |
Frenchtown |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2019-09-15 |
|
| 406-508
| 6 |
Frenchtown |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2020-11-08 |
|
| 406-508
| 7 |
Frenchtown |
MT |
HLNAMTMAUMD |
508J CENTURYLINK COMMUNICATIONS, LLC |
648 |
|
2014-05-24 |
|
| 406-508
| 8 |
Frenchtown |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-07-05 |
|
| 406-508
| 9 |
Frenchtown |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2021-07-05 |
|
| 406-509
| A |
Missoula |
MT |
GRFLMTMAX7X |
114J EXIANT COMMUNICATIONS LLC |
648 |
|
2026-07-27 |
|
| 406-509
| 9 |
Missoula |
MT |
GRFLMTMAX7X |
114J EXIANT COMMUNICATIONS LLC |
648 |
|
2026-07-27 |
|
| 406-510
| A |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
|
|
| 406-510
| 0 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 1 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 2 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 3 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 4 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 5 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 6 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 7 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 8 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-510
| 9 |
Missoula |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2017-04-21 |
|
| 406-512
| A |
Boulder |
MT |
MSSLMTMA0MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
648 |
|
|
|
| 406-512
| 0 |
Boulder |
MT |
GRFLMTMAHMD |
073H TELNYX LLC |
648 |
|
2023-07-16 |
|
| 406-512
| 1 |
Boulder |
MT |
MSSLMTMA0MD |
9415 LEVEL 3 COMMUNICATIONS, LLC - MT |
648 |
|
2023-04-25 |
|
| 406-512
| 2 |
Boulder |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2023-04-26 |
|
| 406-512
| 8 |
Boulder |
MT |
GRFLMTMA7MD |
453F ONVOY, LLC - MT |
648 |
|
2023-08-20 |
|
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Last updated: Sat, 10 Oct 2026 15:24:20 UTC
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