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: 510

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-510 A Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 0 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 1 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 2 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 3 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 4 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 5 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 6 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 7 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 8 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-510 9 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.