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: 272

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-272 A Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-272 0 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2010-06-17   
406-272 1 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650      
406-272 2 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2011-06-19   
406-272 3 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2011-06-19   
406-272 4 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2011-09-18   
406-272 5 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2010-10-21   
406-272 6 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2012-09-09   
406-272 7 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2012-09-09   
406-272 8 Billings MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2011-09-16   
406-272 9 Billings MT BLNGMTMALMD  994E BANDWIDTH.COM CLEC, LLC - MT 650   2012-09-09   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.