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: 423 [Rate centres in NPA 423] [Dial plan for NPA 423]

NXX: 591

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-591 A Chattanooga TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472      
423-591 0 Chattanooga TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472   2008-03-02   
423-591 1 Chattanooga TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472   2008-02-24   
423-591 6 Chattanooga TN CHTGTN12X8X  7278 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 472   2008-09-09   
423-591 7 Chattanooga TN CHTITNCDDS0  4645 ELECTRIC POWER BOARD OF CHATTANOOGA 472   2010-04-12   
423-591 8 Chattanooga TN CHTITNCDDS0  4645 ELECTRIC POWER BOARD OF CHATTANOOGA 472   2008-07-02   
423-591 9 Chattanooga TN CHTITNCDDS0  4645 ELECTRIC POWER BOARD OF CHATTANOOGA 472   2008-07-02   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.