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: GRFLMTMA7MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-991 3 Marion MT 453F ONVOY, LLC - MT 648   2019-10-28   
406-991 4 Marion MT 453F ONVOY, LLC - MT 648   2019-09-15   
406-991 7 Marion MT 453F ONVOY, LLC - MT 648   2007-12-06   
406-991 8 Marion MT 453F ONVOY, LLC - MT 648   2011-03-05   

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Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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