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: DLLSTXADDS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
469-374 A Dallas TX 9533 SOUTHWESTERN BELL 552      
469-477 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-233 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-239 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-383 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-385 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-386 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-387 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-392 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-419 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-455 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-490 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-628 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-661 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-663 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-715 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-763 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-788 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-934 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-980 A Dallas TX 9533 SOUTHWESTERN BELL 552      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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