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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

St Mary, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-732 A STMYMTMARS1  9636 QWEST CORPORATION 648      
406-732 0 GRFLMTMAHMD  073H TELNYX LLC 648   2020-08-13   
406-732 1 GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-11-08   
406-732 2 GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2019-09-15   
406-732 3 MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2014-05-24   
406-732 4 STMYMTMARS1  9636 QWEST CORPORATION 648      
406-732 5 STMYMTMARS1  9636 QWEST CORPORATION 648      
406-732 6 GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2007-03-19   
406-732 7 GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2019-09-15   
406-732 8 GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2011-10-24   
406-732 9 STMYMTMARS1  9636 QWEST CORPORATION 648      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.