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: 300

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-300 A Kalispell MT KLSLMTAZDS0  008E BRESNAN BROADBAND OF MONTANA, LLC - MT [CHARTER] 648      
406-300 0 Kalispell MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2016-05-06   
406-300 1 Kalispell MT KLSLMTAZDS0  008E BRESNAN BROADBAND OF MONTANA, LLC - MT [CHARTER] 648   2013-09-13   
406-300 2 Kalispell MT HLNAMTMAX1X  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 648   2014-07-14   
406-300 3 Kalispell MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-05-15   
406-300 4 Kalispell MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2016-07-29   
406-300 5 Kalispell MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2017-11-20   
406-300 6 Kalispell MT MSSLMTMAYMD  771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2014-06-06   
406-300 7 Kalispell MT HLNAMTMAUMD  508J CENTURYLINK COMMUNICATIONS, LLC 648   2014-05-24   
406-300 8 Kalispell MT MSSLMTMACMD  5562 METROPCS, INC. 648   2018-05-24   
406-300 9 Kalispell MT MSSLMTMACMD  5562 METROPCS, INC. 648   2020-07-26   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.