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: MRDLTXXADS0

Remotes:

Switch Switch name Switch type
FNTRTXXARS0  FENTRESS  1RC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
512-357 A Martindale TX 2154 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 558      
512-357 0 Martindale TX 2154 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 558      
512-357 1 Martindale TX 2154 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 558      
512-357 2 Martindale TX 2154 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 558      
512-357 6 Martindale TX 2154 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 558      
512-357 9 Martindale TX 2154 FRONTIER SOUTHWEST INC DBA FRONTIER COMM OF TEXAS 558      

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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