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.

Canyon Creek, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-307 A   792K CHARTER IP ENABLED SERVICES, LLC 648   2025-05-02   
406-307 1   792K CHARTER IP ENABLED SERVICES, LLC 648   2025-05-02   
406-368 A CNCKMTXCRS1  2244 LINCOLN TEL. CO., INC. 648      

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.