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: 445

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-445 A Surgoinsville TN KNVLTNMA84Z  516C AT&T CORP. 474      
423-445 0 Surgoinsville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2016-04-03   
423-445 1 Surgoinsville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2016-04-03   
423-445 2 Surgoinsville TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474   2017-06-03   
423-445 3 Surgoinsville TN KNVLTNIIDS0  7278 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 474   2017-01-16   
423-445 4 Surgoinsville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2016-05-26   
423-445 5 Surgoinsville TN KNVLTNMA84Z  516C AT&T CORP. 474   2011-11-02   
423-445 6 Surgoinsville TN KNVLTNMA54Z  114F TELEPORT COMMUNICATIONS AMERICA, LLC - TN 474   2017-01-20   
423-445 7 Surgoinsville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2018-03-31   
423-445 8 Surgoinsville TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474   2018-09-22   
423-445 9 Surgoinsville TN KNVLTNMAY8X  624H ONVOY SPECTRUM, LLC 474   2023-06-17   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.