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: 839

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-839 A Morristown TN MRTWTN281MD  792K CHARTER IP ENABLED SERVICES, LLC 474   2025-01-23   
423-839 0 Morristown TN MRTWTN281MD  792K CHARTER IP ENABLED SERVICES, LLC 474   2005-07-23   
423-839 1 Morristown TN MRTWTN281MD  792K CHARTER IP ENABLED SERVICES, LLC 474   2006-04-07   
423-839 2 Morristown TN MRTWTN281MD  792K CHARTER IP ENABLED SERVICES, LLC 474   2007-05-21   
423-839 3 Morristown TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2007-07-15   
423-839 4 Morristown TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2009-03-12   
423-839 5 Morristown TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2008-12-13   
423-839 6 Morristown TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2009-08-02   
423-839 7 Morristown TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2009-09-06   
423-839 8 Morristown TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2009-11-08   
423-839 9 Morristown TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2012-12-02   

Last updated: Fri, 10 Jul 2026 02:55:48 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.