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.

Decker, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-757 A DCKRMTXCRS1  2251 RANGE TEL COOP INC 654      
406-757 0   2251 RANGE TEL COOP INC 654      
406-757 1   2251 RANGE TEL COOP INC 654      
406-757 2   2251 RANGE TEL COOP INC 654      
406-757 3   2251 RANGE TEL COOP INC 654      
406-757 4   2251 RANGE TEL COOP INC 654      
406-757 5   2251 RANGE TEL COOP INC 654      
406-757 6   2251 RANGE TEL COOP INC 654      
406-757 7   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 654   2026-10-05   
406-757 9   2251 RANGE TEL COOP INC 654      

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.