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: 233

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-233 A Miles City MT MLCYMTMADS0  9636 QWEST CORPORATION 650      
406-233 0 Miles City MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2022-01-06   
406-233 1 Miles City MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2006-10-20   
406-233 2 Miles City MT MLCYMTMADS0  9636 QWEST CORPORATION 650      
406-233 3 Miles City MT MLCYMTMADS0  9636 QWEST CORPORATION 650      
406-233 4 Miles City MT MLCYMTMADS0  9636 QWEST CORPORATION 650      
406-233 6 Miles City MT BLNGMTWE6MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 650   2005-02-21   
406-233 7 Miles City MT MLCYMTMADS0  9636 QWEST CORPORATION 650      
406-233 8 Miles City MT   145J TERRA NOVA TELECOM INC. 650   2020-11-19   
406-233 9 Miles City MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2009-02-13   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.