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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Irving, TX

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
972-999 5 DLLTTX01DMD  5562 METROPCS, INC. 552   2005-09-29   
972-999 6 DLLTTX01DMD  5562 METROPCS, INC. 552   2005-09-29   
972-999 7 DLLTTX01DMD  5562 METROPCS, INC. 552   2005-09-29   
972-999 8 DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
972-999 9   145J TERRA NOVA TELECOM INC. 552   2024-06-27   

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

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