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: DLLSTXFRDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
214-302 A Dallas TX 9533 SOUTHWESTERN BELL 552      
214-371 A Dallas TX 9533 SOUTHWESTERN BELL 552      
214-372 A Dallas TX 9533 SOUTHWESTERN BELL 552      
214-374 A Dallas TX 9533 SOUTHWESTERN BELL 552      
214-375 A Dallas TX 9533 SOUTHWESTERN BELL 552      
214-376 A Dallas TX 9533 SOUTHWESTERN BELL 552      

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

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