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.

NPA: 406 [Rate centres in NPA 406] [Dial plan for NPA 406]

NXX: 476

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-476 A Dutton MT DTTNMTMARS1  9636 QWEST CORPORATION 648      
406-476 0 Dutton MT GRFLMTMAHMD  073H TELNYX LLC 648   2020-08-09   
406-476 1 Dutton MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2012-12-17   
406-476 2 Dutton MT MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2017-10-20   
406-476 3 Dutton MT DTTNMTMARS1  9636 QWEST CORPORATION 648      
406-476 4 Dutton MT   624H ONVOY SPECTRUM, LLC 648   2025-02-02   
406-476 5 Dutton MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2011-10-21   
406-476 6 Dutton MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2020-11-08   
406-476 7 Dutton MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2007-03-19   
406-476 8 Dutton MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-03-07   
406-476 9 Dutton MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-03-07   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.