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.
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NPA: 423 [Rate centres in NPA 423] [Dial plan for NPA 423]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-820 A Greeneville TN   525E ONVOY, LLC - TN 956   2018-06-16   
423-820 0 Greeneville TN   525E ONVOY, LLC - TN 956   2019-06-06   
423-820 1 Greeneville TN   525E ONVOY, LLC - TN 956   2019-06-06   
423-820 8 Greeneville TN   525E ONVOY, LLC - TN 956   2018-06-16   
423-820 9 Greeneville TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 956   2020-09-11   

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

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