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: AUSTTXGR58Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
512-325 1 Leander TX 515J IP HORIZON LLC 558   2023-12-28   
512-325 8 Leander TX 515J IP HORIZON LLC 558   2023-12-28   
737-264 0 Lockhart TX 515J IP HORIZON LLC 558   2021-03-18   
737-278 4 Bastrop TX 515J IP HORIZON LLC 558   2021-03-18   
737-281 A Austin TX 515J IP HORIZON LLC 558      
737-338 5 Elgin TX 515J IP HORIZON LLC 558   2021-03-18   
737-766 1 Leander TX 515J IP HORIZON LLC 558   2021-03-18   
737-837 9 Taylor TX 515J IP HORIZON LLC 558   2021-03-18   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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