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: HLNAMTMADS0

Remotes:

Switch Switch name Switch type
EHLNMTMARS1  EAST HELENA  5ER 
HLNAMTNORS1  HELENA NORTH  5ER 

<< 1 2

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
406-841 4 Helena MT 9636 QWEST CORPORATION 648      
406-841 5 Helena MT 9636 QWEST CORPORATION 648      
406-841 7 Helena MT 9636 QWEST CORPORATION 648      
406-841 8 Helena MT 9636 QWEST CORPORATION 648      
406-841 9 Helena MT 9636 QWEST CORPORATION 648      

<< 1 2

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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