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: SHFDIAXRDS0

Remotes:

Switch Switch name Switch type
MSRVIAXORS3  MESERVEY  1RE 
SWDLIAXORS9  SWALEDALE  1RE 
THTNIAXORS9  THORNTON  1RE 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
641-892 A Sheffield IA 1127 FRONTIER COMMUNICATIONS OF IOWA, INC. 632      
641-892 0 Sheffield IA 1127 FRONTIER COMMUNICATIONS OF IOWA, INC. 632      
641-892 4 Sheffield IA 1127 FRONTIER COMMUNICATIONS OF IOWA, INC. 632      
641-892 8 Sheffield IA 1127 FRONTIER COMMUNICATIONS OF IOWA, INC. 632      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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