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: MSSLMTXCDS0

Remotes:

Switch Switch name Switch type
ALTAMTXCRS1  ALTA  1RE 
ALTNMTXBRS1  ALBERTON  1RE 
ALTNMTXCRS1  ALBERTON  1RE 
AVONMTXCRS1  AVON  1RE 
CHRLMTXCRS1  CHARLO  1RE 
CLTNMTXCRS1  CLINTON  1RE 
GRFLMTMARS0  GREAT FALLS  666 
HAGNMTXCRS1  HAUGAN  1RE 
NOXNMTXCRS1  NOXON  1RE 
PHBGMTXCRS1  PHILIPSBURG  1RE 
PLNSMTXCRS1  PLAINS  1RE 
THFLMTXCRS1  THOMPSON FALLS  1RE 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
208-942 A Powell ID 2235 BLACKFOOT TEL. COOP., INC. 648      
406-332 A Pablo MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-332 9 Pablo MT 2235 BLACKFOOT TEL. COOP., INC. 648      
406-532 A Missoula MT 7870 BLACKFOOT COMMUNICATIONS, INC. - MT 648      
406-541 A Missoula MT 7870 BLACKFOOT COMMUNICATIONS, INC. - MT 648      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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