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: 731

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-731 A New Tazewell TN MRTWTN281MD  792K CHARTER IP ENABLED SERVICES, LLC 474   2026-01-25   
423-731 0 New Tazewell TN KNVLTNIIAMD  6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 474   2026-03-10   
423-731 1 New Tazewell TN MRTWTN281MD  792K CHARTER IP ENABLED SERVICES, LLC 474   2026-01-25   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.