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: 679

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-679 A Ooltewah TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472      
423-679 1 Ooltewah TN CHTGTNNSXMZ  624H ONVOY SPECTRUM, LLC 472   2023-06-17   
423-679 2 Ooltewah TN   490J DISH WIRELESS, LLC 472   2024-07-31   
423-679 3 Ooltewah TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472   2021-07-11   
423-679 4 Ooltewah TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472   2021-07-11   
423-679 5 Ooltewah TN   490J DISH WIRELESS, LLC 472   2024-03-31   
423-679 7 Ooltewah TN CHTGTNNSXTZ  506J TWILIO INTERNATIONAL, INC. 472   2021-08-08   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.