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: 868

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-868 A Mosheim TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-868 0 Mosheim TN JHCYTNXCXPY  624H ONVOY SPECTRUM, LLC 956   2024-03-05   
423-868 1 Mosheim TN   792K CHARTER IP ENABLED SERVICES, LLC 956   2025-11-16   
423-868 2 Mosheim TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956   2023-10-23   
423-868 8 Mosheim TN   145J TERRA NOVA TELECOM INC. 956   2025-10-06   

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.