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.

Fairfield, MT

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
406-467 A FRFDMTXCDS1  2255 3 RIVERS TEL. COOP., INC. 648      
406-467 0   2255 3 RIVERS TEL. COOP., INC. 648   2023-12-31   
406-467 1   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 2   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 3   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 4   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 5   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 6   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 7   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 8   2255 3 RIVERS TEL. COOP., INC. 648      
406-467 9   2255 3 RIVERS TEL. COOP., INC. 648      
406-504 A MSSLMTMA0MD  9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648      
406-504 2   9415 LEVEL 3 COMMUNICATIONS, LLC - MT 648   2021-05-19   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.