Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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OCN: 792K CHARTER IP ENABLED SERVICES, LLC

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
406-330 A Clinton MT MSSLMTEH4MD  648      
406-330 2 Clinton MT   648   2006-06-03   
406-332 1 Pablo MT   648   2024-03-31   
406-333 2 Livingston MT   650   2006-05-17   
406-348 5 Huntley MT   650   2025-04-08   
406-353 1 Harlem MT   648   2021-04-23   
406-357 6 Chinook MT   648   2021-04-23   
406-361 8 Hamilton MT   648   2014-05-05   
406-371 5 Billings MT   650   2006-12-08   
406-371 7 Billings MT   650   2014-04-30   
406-375 5 Hamilton MT   648   2006-05-17   
406-393 A Somers MT KLSLMTAZ1MD  648      
406-393 2 Somers MT   648   2006-05-21   
406-404 A Bozeman MT BZMNMTEF2MD  650      
406-404 1 Bozeman MT   650   2012-06-01   
406-415 A Deer Lodge MT HLNAMTHH5MD  648      
406-415 1 Deer Lodge MT   648   2010-06-07   
406-420 A Bigfork MT KLSLMTAZ1MD  648      
406-420 2 Bigfork MT   648   2006-04-21   
406-422 A Helena MT HLNAMTHH5MD  648      
406-422 0 Helena MT   648   2006-03-14   
406-422 1 Helena MT   648   2007-10-19   
406-422 4 Helena MT   648   2008-04-09   
406-422 5 Helena MT   648   2005-05-06   
406-445 3 Red Lodge MT   650   2011-03-27   
406-468 6 Cascade MT   648   2020-09-05   
406-493 A Missoula MT MSSLMTEH4MD  648      
406-493 0 Missoula MT   648   2006-06-19   
406-493 1 Missoula MT   648   2007-10-01   
406-493 6 Missoula MT   648   2005-08-13   
406-502 A Helena MT HLNAMTHH5MD  648      
406-502 1 Helena MT   648   2012-06-01   
406-502 2 Helena MT   648   2014-04-30   
406-513 A Helena MT HLNAMTHH5MD  648      
406-513 1 Helena MT   648   2008-05-30   
406-534 A Billings MT BLNGMT93HMD  650      
406-534 1 Billings MT   650   2006-03-26   
406-534 2 Billings MT   650   2005-04-29   
406-534 3 Billings MT   650   2005-10-22   
406-534 4 Billings MT   650   2007-09-21   
406-534 6 Billings MT   650   2010-06-27   
406-534 8 Billings MT   650   2014-03-24   
406-540 4 Missoula MT   648   2014-05-28   
406-551 2 Bozeman MT   650   2006-12-08   
406-563 0 Anaconda MT   648   2006-04-09   
406-565 5 Butte MT   648   2005-05-13   
406-571 A Finley Point MT KLSLMTAZ1MD  648      
406-571 2 Finley Point MT   648   2006-04-21   
406-577 2 Bozeman MT   650   2011-07-28   
406-601 1 Billings MT   650   2016-11-24   

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Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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