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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-299 6 Butte MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2014-10-20   
406-300 6 Kalispell MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2014-06-06   
406-303 A Missoula MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648      
406-303 6 Missoula MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2012-06-14   
406-317 0 Missoula MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2019-09-10   
406-417 6 Helena MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2014-11-20   
406-501 7 Whitehall MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2020-08-24   
406-614 3 Bigfork MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2023-01-08   
406-770 6 Great Falls MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2013-03-18   
406-792 0 Butte MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2019-05-27   
406-808 3 Havre MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2016-03-21   
406-863 5 Whitefish MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2015-05-22   
406-884 7 Polson MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2015-06-15   
406-925 6 Dillon MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2019-05-10   
406-968 6 Lewistown MT 771G TELEPORT COMMUNICATIONS AMERICA MT - LLC 648   2019-05-03   

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

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