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: 815

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
406-815 A Red Lodge MT BLNGMTMAX5X  7421 AT&T - LOCAL 650      
406-815 0 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2023-08-20   
406-815 1 Red Lodge MT   6564 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 650   2025-07-23   
406-815 4 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2020-11-10   
406-815 5 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2020-11-10   
406-815 6 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2020-01-05   
406-815 7 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-03-07   
406-815 8 Red Lodge MT BLNGMTAS9MD  453F ONVOY, LLC - MT 650   2021-03-07   
406-815 9 Red Lodge MT BLNGMTMAX5X  7421 AT&T - LOCAL 650   2022-03-08   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.