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: SNAOTXWC0MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
210-210 A San Antonio TX 473F USFON, INC. - TX 566      
210-800 A San Antonio TX 139F WORLDCALL INTERCONNECT INC. 566      
726-245 A San Antonio TX 139F WORLDCALL INTERCONNECT INC. 566      
726-333 A San Antonio TX 473F USFON, INC. - TX 566      
726-666 A San Antonio TX 139F WORLDCALL INTERCONNECT INC. 566      
726-726 A San Antonio TX 139F WORLDCALL INTERCONNECT INC. 566      
726-777 A San Antonio TX 139F WORLDCALL INTERCONNECT INC. 566      
726-888 A San Antonio TX 473F USFON, INC. - TX 566      
726-999 A San Antonio TX 473F USFON, INC. - TX 566      
830-667 A Fowlerton TX 139F WORLDCALL INTERCONNECT INC. 566      
830-888 A Gonzales TX 139F WORLDCALL INTERCONNECT INC. 566      
830-967 A Waelder TX 139F WORLDCALL INTERCONNECT INC. 566      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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