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: DLLSTXRIZMD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
972-807 6 Dallas TX 793K TWC IP ENABLED SERVICES, LLC 552   2011-05-23   
972-807 9 Dallas TX 793K TWC IP ENABLED SERVICES, LLC 552   2011-05-23   
972-925 0 Dallas TX 793K TWC IP ENABLED SERVICES, LLC 552   2011-05-23   
972-925 9 Dallas TX 793K TWC IP ENABLED SERVICES, LLC 552   2011-05-23   
972-982 0 Dallas TX 793K TWC IP ENABLED SERVICES, LLC 552   2012-02-07   
972-982 2 Dallas TX 793K TWC IP ENABLED SERVICES, LLC 552   2012-02-07   
972-987 5 Frisco TX 793K TWC IP ENABLED SERVICES, LLC 552      

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Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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