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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Ashland, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-784 A ASLDMTXCRS1  2251 RANGE TEL COOP INC 650      
406-784 2   2251 RANGE TEL COOP INC 650      
406-784 4   2251 RANGE TEL COOP INC 650      
406-784 6   2251 RANGE TEL COOP INC 650      
406-784 9   2251 RANGE TEL COOP INC 650      
406-983 A BLNGMTWEIMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-983 0   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      
406-983 1   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2018-08-27   
406-983 2   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2018-12-17   
406-983 9   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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