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: DLLSTXREDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
972-863 4 Dallas TX 9533 SOUTHWESTERN BELL 552   2009-06-07   
972-863 5 Dallas TX 9533 SOUTHWESTERN BELL 552   2009-06-07   
972-930 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 0 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 2 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 3 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 4 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 6 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 7 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 8 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-930 9 Dallas TX 9533 SOUTHWESTERN BELL 552      
972-931 A Dallas TX 9533 SOUTHWESTERN BELL 552      

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Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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