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: FTWOTXMADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
817-378 A Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-378 0 Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-378 1 Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-378 2 Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-378 3 Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-378 5 Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-378 8 Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-378 9 Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-624 A Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-625 A Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-626 A Fort Worth TX 9533 SOUTHWESTERN BELL 552      
817-740 A Fort Worth TX 9533 SOUTHWESTERN BELL 552      

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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