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.

Karnack, TX

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
430-975 A KRNCTXXAPS0  1181 VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 554      
430-975 0 LGVWTXPLXZX  073H TELNYX LLC 554   2021-03-19   
430-975 1 LGVWTXPLXMY  793K TWC IP ENABLED SERVICES, LLC 554   2025-03-23   
430-975 2 LGVWTXPLX3Y  624H ONVOY SPECTRUM, LLC 554   2021-12-04   
430-975 3 LGVWTXPLX3Y  624H ONVOY SPECTRUM, LLC 554   2021-12-04   
430-975 5 LGVWTXPLXEX  903C ONVOY, LLC - TX 554   2021-03-19   
430-975 7 LGVWTXPLX3Y  624H ONVOY SPECTRUM, LLC 554   2021-06-28   
430-975 8 LGVWTXPLXEX  903C ONVOY, LLC - TX 554   2018-11-13   
430-975 9 KRNCTXXAPS0  1181 VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 554   2015-09-04   
903-679 A KRNCTXXARP0  1181 VALOR TELECOMM TX, LD-TX #2 DBA WINDSTREAM COMM SW 554      

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.