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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Hysham, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-342 A HYSHMTXCRS1  2251 RANGE TEL COOP INC 650      
406-342 0   2251 RANGE TEL COOP INC 650      
406-342 1   2251 RANGE TEL COOP INC 650      
406-342 2   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2026-06-08   
406-342 4   2251 RANGE TEL COOP INC 650      
406-342 5   2251 RANGE TEL COOP INC 650      
406-342 6   2251 RANGE TEL COOP INC 650      
406-342 7   2251 RANGE TEL COOP INC 650      
406-342 8   2251 RANGE TEL COOP INC 650      
406-342 9   2251 RANGE TEL COOP INC 650      

Last updated: Sat, 02 May 2026 12:20:53 UTC

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