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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Pablo, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-275 A FHIRMT01RS0  2252 RONAN TEL. CO. 648      
406-332 A MSSLMTXCDS0  2235 BLACKFOOT TEL. COOP., INC. 648      
406-332 1 MSSLMTEH4MD  792K CHARTER IP ENABLED SERVICES, LLC 648   2024-03-31   
406-332 9 MSSLMTXCDS0  2235 BLACKFOOT TEL. COOP., INC. 648      
406-675 A PABLMTXCRS1  2252 RONAN TEL. CO. 648      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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