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.

NPA: 737 [Rate centres in NPA 737] [Dial plan for NPA 737]

NXX: 417

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-417 A Liberty Hill TX   515J IP HORIZON LLC 558   2025-05-25   
737-417 1 Liberty Hill TX   515J IP HORIZON LLC 558   2025-05-25   
737-417 2 Liberty Hill TX   515J IP HORIZON LLC 558   2025-05-25   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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