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: DLLSTXMSDS0

Remotes:

Switch Switch name Switch type
DLLSTXSUDS0  Sunnyvale  5ER 
RKWLTXPADS0  Rockwall  EXM 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
214-664 A Dallas TX 9533 SOUTHWESTERN BELL 552      
469-726 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-204 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-216 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-222 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-284 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-285 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-288 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-289 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-290 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-329 A Dallas TX 9533 SOUTHWESTERN BELL 552      
972-882 A Dallas TX 9533 SOUTHWESTERN BELL 552      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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