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: 220

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-220 A Erwin TN JHCYTNXCYZZ  829J PAETEC ITEL, LLC 956   2024-12-07   
423-220 0 Erwin TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 956   2006-12-04   
423-220 1 Erwin TN   829J PAETEC ITEL, LLC 956      
423-220 2 Erwin TN   624H ONVOY SPECTRUM, LLC 956   2024-03-05   
423-220 3 Erwin TN   124F BANDWIDTH.COM CLEC, LLC - TN 956   2021-02-08   
423-220 4 Erwin TN   525E ONVOY, LLC - TN 956   2018-06-09   
423-220 5 Erwin TN   792K CHARTER IP ENABLED SERVICES, LLC 956   2025-11-16   
423-220 6 Erwin TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 956   2003-05-13   
423-220 7 Erwin TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 956   2004-05-16   
423-220 8 Erwin TN   525E ONVOY, LLC - TN 956   2022-09-29   
423-220 9 Erwin TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 956   2005-07-15   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.