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: 266

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-266 A Townsend MT TWNSMTMARS1  9636 QWEST CORPORATION 648      
406-266 0 Townsend MT HLNAMTHHPS1  008E BRESNAN BROADBAND OF MONTANA, LLC - MT [CHARTER] 648   2019-06-14   
406-266 1 Townsend MT MSSLMTAG5MD  6010 NEW CINGULAR WIRELESS PCS, LLC 648   2010-11-06   
406-266 2 Townsend MT HLNAMTMANMD  357E YMAX COMMUNICATIONS CORP. - MT 648   2010-03-27   
406-266 3 Townsend MT TWNSMTMARS1  9636 QWEST CORPORATION 648      
406-266 4 Townsend MT TWNSMTMARS1  9636 QWEST CORPORATION 648      
406-266 5 Townsend MT TWNSMTMARS1  9636 QWEST CORPORATION 648      
406-266 6 Townsend MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2021-07-08   
406-266 7 Townsend MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648   2007-03-19   
406-266 8 Townsend MT HLNAMTMANMD  357E YMAX COMMUNICATIONS CORP. - MT 648   2008-11-06   
406-266 9 Townsend MT TWNSMTMARS1  9636 QWEST CORPORATION 648      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.