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.

Rule, TX

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
940-572 A SYMRTXXA0MD  0132 AMA COMM., LLC DBA AMA*TECHTEL COMMUNICATIONS-TX 548      
940-996 A SYMRTX01DS0  4046 SANTA ROSA TELEPHONE COOPERATIVE, INC. 548      
940-997 A RULETXXARS0  1163 VALOR TELECOMM TX, LP-TX #1 DBA WINDSTREAM COMM SW 548      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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