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: 515

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-515 A South Pittsburg TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472      
423-515 0 South Pittsburg TN   073H TELNYX LLC 472   2021-01-23   
423-515 1 South Pittsburg TN   525E ONVOY, LLC - TN 472   2021-03-15   
423-515 2 South Pittsburg TN   525E ONVOY, LLC - TN 472   2021-07-11   
423-515 3 South Pittsburg TN   525E ONVOY, LLC - TN 472   2021-07-11   
423-515 5 South Pittsburg TN   525E ONVOY, LLC - TN 472   2019-11-29   
423-515 6 South Pittsburg TN   525E ONVOY, LLC - TN 472   2019-11-29   
423-515 7 South Pittsburg TN   4645 ELECTRIC POWER BOARD OF CHATTANOOGA 472   2020-02-27   
423-515 8 South Pittsburg TN   525E ONVOY, LLC - TN 472   2022-12-05   
423-515 9 South Pittsburg TN   525E ONVOY, LLC - TN 472   2022-12-05   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.