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.

Switch: DLLSTXALDS4

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
972-970 9 Grand Prairie TX 903C ONVOY, LLC - TX 552   2022-04-29   
972-972 A Dallas TX 903C ONVOY, LLC - TX 552      
972-972 9 Dallas TX 903C ONVOY, LLC - TX 552   2017-12-17   
972-975 5 Grand Prairie EMS TX 903C ONVOY, LLC - TX 552   2011-04-26   
972-975 6 Grand Prairie EMS TX 903C ONVOY, LLC - TX 552   2011-04-26   
972-984 2 McKinney TX 903C ONVOY, LLC - TX 552   2008-09-13   
972-984 7 McKinney TX 903C ONVOY, LLC - TX 552   2008-08-02   
972-992 9 Grand Prairie TX 903C ONVOY, LLC - TX 552   2024-07-05   

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Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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