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: 334

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-334 A Libby MT CRALIDABXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 960      
406-334 0 Libby MT CRALIDABXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 960      
406-334 1 Libby MT CRALIDABXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 960   2005-12-12   
406-334 2 Libby MT CRALIDXXX7X  453F ONVOY, LLC - MT 960   2020-09-06   
406-334 3 Libby MT CRALIDXXGMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 960   2011-08-02   
406-334 4 Libby MT CRALIDABXMD  6010 NEW CINGULAR WIRELESS PCS, LLC 960   2014-10-23   
406-334 5 Libby MT CRALIDXXXBX  357E YMAX COMMUNICATIONS CORP. - MT 960   2011-04-08   
406-334 6 Libby MT CRALIDXXGMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 960   2020-12-15   
406-334 7 Libby MT CRALIDXXGMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 960   2013-03-12   
406-334 8 Libby MT CRALIDXXX7X  453F ONVOY, LLC - MT 960   2019-10-12   
406-334 9 Libby MT CRALIDXXGMD  6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 960   2017-08-17   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.