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: 378

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-378 A Big Sandy MT HAVRMTXCDS0  2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 0 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 1 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 2 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 3 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 4 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 5 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 6 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 7 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      
406-378 8 Big Sandy MT   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648      
406-378 9 Big Sandy MT   2257 TRIANGLE TEL. COOP. ASSN., INC. 648      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.