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: 848

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-848 A Gardiner MT GRNRMTMARS1  9636 QWEST CORPORATION 650      
406-848 0 Gardiner MT   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2004-11-13   
406-848 1 Gardiner MT   994E BANDWIDTH.COM CLEC, LLC - MT 650   2009-02-13   
406-848 2 Gardiner MT   9636 QWEST CORPORATION 650      
406-848 3 Gardiner MT   6529 T-MOBILE USA, INC. 650   2023-10-09   
406-848 4 Gardiner MT   994E BANDWIDTH.COM CLEC, LLC - MT 650   2014-05-25   
406-848 5 Gardiner MT   453F ONVOY, LLC - MT 650   2011-10-21   
406-848 6 Gardiner MT   453F ONVOY, LLC - MT 650   2007-03-19   
406-848 7 Gardiner MT   9636 QWEST CORPORATION 650      
406-848 8 Gardiner MT   624H ONVOY SPECTRUM, LLC 650   2025-02-17   
406-848 9 Gardiner MT   9636 QWEST CORPORATION 650      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.