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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Busby, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-592 A BSBYMTXCRS1  2251 RANGE TEL COOP INC 650      
406-592 3 BSBYMTXCRS1  2251 RANGE TEL COOP INC 650      
406-592 4 BSBYMTXCRS1  2251 RANGE TEL COOP INC 650      

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

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