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: 436

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-436 A Madisonville TN KNVLTNMANMD  4806 LEVEL 3 COMMUNICATIONS, LLC - TN 474      
423-436 0 Madisonville TN KNVLTNMANMD  4806 LEVEL 3 COMMUNICATIONS, LLC - TN 474      
423-436 1 Madisonville TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474   2014-07-07   
423-436 2 Madisonville TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474   2015-09-10   
423-436 3 Madisonville TN KNVLTNIIDS0  7278 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 474   2011-09-05   
423-436 4 Madisonville TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474   2016-08-22   
423-436 5 Madisonville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2016-06-09   
423-436 6 Madisonville TN KNVLTNMA54Z  114F TELEPORT COMMUNICATIONS AMERICA, LLC - TN 474   2013-04-24   
423-436 7 Madisonville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2016-04-18   
423-436 8 Madisonville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2016-04-18   
423-436 9 Madisonville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2016-06-09   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.