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: CHTGTNNSXYZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
423-709 4 Cleveland TN 478J NUSO, LLC 472   2024-12-06   
423-709 5 Cleveland TN 478J NUSO, LLC 472   2024-12-06   
423-719 A Chattanooga TN 478J NUSO, LLC 472      
423-719 2 Chattanooga TN 478J NUSO, LLC 472   2022-02-03   
423-904 7 Chattanooga TN 478J NUSO, LLC 472   2024-11-24   
423-980 4 Chattanooga TN 478J NUSO, LLC 472   2024-11-24   

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

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