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.
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Switch: TLIATXXAPS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
806-583 A Tulia TX 1181 VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 544      
806-583 9 Tulia TX 1181 VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 544   2018-01-27   

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

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