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: 519

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-519 A Missoula MT GRFLMTMANMD  515J IP HORIZON LLC 648      
406-519 0 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-519 1 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-519 2 Missoula MT MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2021-06-27   
406-519 3 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-05   
406-519 4 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-03-26   
406-519 5 Missoula MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-03-26   
406-519 6 Missoula MT MSSLMTXC3MD  939H COMMIO, LLC 648   2023-09-22   
406-519 7 Missoula MT GRFLMTMANMD  515J IP HORIZON LLC 648   2021-10-22   
406-519 8 Missoula MT MSSLMTMACMD  6529 T-MOBILE USA, INC. 648   2022-05-20   
406-519 9 Missoula MT MSSLMTMACMD  6529 T-MOBILE USA, INC. 648   2022-05-20   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.