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: CLWLTXXADS0

Remotes:

Switch Switch name Switch type
DEVLTXXARS0  DEANVILLE  GTR 
SOVLTXXARS0  SOMERVILLE  GTR 
TUNSTXXGRS0  SNOOK TUNIS  GTR 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
979-567 A Caldwell TX 4344 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 570      

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

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