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: 821

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-821 A Darby MT DRBYMTMARS1  9636 QWEST CORPORATION 648      
406-821 0 Darby MT DRBYMTMARS1  9636 QWEST CORPORATION 648      
406-821 1 Darby MT DRBYMTMARS1  9636 QWEST CORPORATION 648      
406-821 2 Darby MT DRBYMTMARS1  9636 QWEST CORPORATION 648      
406-821 3 Darby MT DRBYMTMARS1  9636 QWEST CORPORATION 648      
406-821 4 Darby MT DRBYMTMARS1  9636 QWEST CORPORATION 648      
406-821 5 Darby MT GRFLMTMAHMD  073H TELNYX LLC 648      
406-821 6 Darby MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-821 7 Darby MT GRFLMTMA7MD  453F ONVOY, LLC - MT 648      
406-821 8 Darby MT MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648      
406-821 9 Darby MT DRBYMTMARS1  9636 QWEST CORPORATION 648      

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.