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: DLLSTXFBDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
214-256 A Dallas TX 9533 SOUTHWESTERN BELL 552      
469-522 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-241 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-243 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-247 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-277 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-280 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-406 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-481 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-484 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-488 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-620 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-884 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-888 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-919 A Dallas TX 9533 SOUTHWESTERN BELL 552      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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