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: CDFLIACODS0

Remotes:

Switch Switch name Switch type
DIKEIACORS1  DIKE  RSC 
DNVRIACORS1  DENVER  RSC 
HDSNIACORS1  HUDSON  RSC 
NHFRIACORS1  NEW HARTFORD  RSC 
PRBGIACORS3  PARKERSBURG  RSC 
WTRLIAWSRS2  WATERLOO WASHBURN  RSC 
WVRLIACORS3  WAVERLY  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
319-222 A Cedar Falls IA 9631 QWEST CORPORATION 635      
319-243 A Cedar Falls IA 9631 QWEST CORPORATION 635      
319-266 A Cedar Falls IA 9631 QWEST CORPORATION 635      
319-268 A Cedar Falls IA 9631 QWEST CORPORATION 635      
319-273 A Cedar Falls IA 9631 QWEST CORPORATION 635      
319-277 A Cedar Falls IA 9631 QWEST CORPORATION 635      
319-859 A Cedar Falls IA 9631 QWEST CORPORATION 635      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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