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

NXX: 423

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-423 A Austin TX   700J WAVENATION, LLC 558   2025-09-12   
737-423 0 Austin TX   700J WAVENATION, LLC 558   2025-09-12   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

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