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.
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Switch: GRFLMTMA7MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-991 4 Marion MT 453F ONVOY, LLC - MT 648      
406-991 7 Marion MT 453F ONVOY, LLC - MT 648      
406-991 8 Marion MT 453F ONVOY, LLC - MT 648      

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

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