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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Joplin, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-292 A HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-292 1 HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-292 2 MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2019-01-18   
406-292 3 HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-292 4 HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-292 7 HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-292 9 HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

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