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: SNANTXTHRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
210-621 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-621 1 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-621 2 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-621 9 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-626 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-626 0 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-626 1 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-626 2 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-626 3 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-626 5 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-626 9 San Antonio TX 9533 SOUTHWESTERN BELL 566      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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