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: 438

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-438 A Austin TX   883K AHOI LLC 558   2026-05-17   
737-438 4 Austin TX   883K AHOI LLC 558   2026-05-17   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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