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: 324

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-324 A Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-324 0 Helena MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648      
406-324 1 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-324 2 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-324 3 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-324 4 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-324 5 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-324 6 Helena MT HLNAMTMADS0  9636 QWEST CORPORATION 648      
406-324 7 Helena MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-324 9 Helena MT GRFLMTMAHMD  073H TELNYX LLC 648      

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.