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.

Switch: GRFLMTMAHMD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-854 0 Marion MT 073H TELNYX LLC 648   2020-08-13   
406-857 0 Somers MT 073H TELNYX LLC 648   2020-08-13   
406-858 9 Kalispell MT 073H TELNYX LLC 648   2022-11-27   
406-865 8 Dillon MT 073H TELNYX LLC 648   2020-08-07   
406-888 3 West Glacier MT 073H TELNYX LLC 648   2020-08-13   
406-909 1 Columbia Falls MT 073H TELNYX LLC 648   2020-08-07   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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