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: 686

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-686 A Clyde Park MT CLPKMTMARS1  9636 QWEST CORPORATION 650      
406-686 0 Clyde Park MT BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2004-11-13   
406-686 1 Clyde Park MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2010-02-20   
406-686 2 Clyde Park MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2011-01-10   
406-686 3 Clyde Park MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2011-04-10   
406-686 4 Clyde Park MT CLPKMTMARS1  9636 QWEST CORPORATION 650      
406-686 5 Clyde Park MT   6529 T-MOBILE USA, INC. 650   2024-03-15   
406-686 6 Clyde Park MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2009-02-13   
406-686 7 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2007-04-14   
406-686 8 Clyde Park MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2011-10-20   
406-686 9 Clyde Park MT CLPKMTMARS1  9636 QWEST CORPORATION 650      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.