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.

Switch: MSSLMTMAHMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-274 A Missoula MT 7421 AT&T - LOCAL 648      
406-274 9 Missoula MT 7421 AT&T - LOCAL 648      
406-419 A Victor MT 7421 AT&T - LOCAL 648      
406-419 9 Victor MT 7421 AT&T - LOCAL 648   2019-10-01   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.