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: BLNGMT20PS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-294 A Billings MT 4222 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 650      
406-384 A Billings MT 4222 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 650      
406-869 A Billings MT 4222 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 650      
406-922 A Bozeman MT 4222 ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 650      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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