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: SNANTXCAY0X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
210-866 A San Antonio TX 425J CSC WIRELESS, LLC 566      
210-866 2 San Antonio TX 425J CSC WIRELESS, LLC 566   2020-08-03   
830-658 0 Big Wells TX 425J CSC WIRELESS, LLC 566   2021-10-30   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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