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: SNANTXWEDS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
210-490 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-491 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-494 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-495 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-496 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-497 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-499 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-545 A San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-588 3 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-588 4 San Antonio TX 9533 SOUTHWESTERN BELL 566      
210-686 8 San Antonio TX 9533 SOUTHWESTERN BELL 566   2017-09-25   
210-730 9 San Antonio TX 9533 SOUTHWESTERN BELL 566      

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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