Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

NXX: 412

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-412 A Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 0 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 1 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 2 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 3 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 4 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 5 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 6 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 7 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 8 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-412 9 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.