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: 831

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-831 A Billings MT BLNGMT933MD  073H TELNYX LLC 650      
406-831 0 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650      
406-831 1 Billings MT BLNGMT933MD  073H TELNYX LLC 650      
406-831 2 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-831 3 Billings MT BLNGMTMAMMD  6010 NEW CINGULAR WIRELESS PCS, LLC 650      
406-831 4 Billings MT BLNGMTWEBMD  771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 650      
406-831 5 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-831 6 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-831 7 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-831 8 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-831 9 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.