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: HNVIALUNX9Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
256-819 A Huntsville AL 478J NUSO, LLC 477      
256-819 1 Huntsville AL 478J NUSO, LLC 477   2020-11-02   
662-676 6 Red Bay MS 478J NUSO, LLC 477   2020-10-16   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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