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.
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Switch: AUSTTX92X0X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
512-222 A Austin TX 139F WORLDCALL INTERCONNECT INC. 558      
512-333 A Austin TX 473F USFON, INC. - TX 558      
512-512 A Austin TX 473F USFON, INC. - TX 558      
512-666 A Austin TX 139F WORLDCALL INTERCONNECT INC. 558      
512-777 A Austin TX 139F WORLDCALL INTERCONNECT INC. 558      
512-999 A Bastrop TX 139F WORLDCALL INTERCONNECT INC. 558      
737-737 A San Marcos TX 473F USFON, INC. - TX 558      

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

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