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: 640

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-640 A Sneedville TN KNVLTNMAYGX  7421 AT&T - LOCAL 474      
423-640 6 Sneedville TN KNVLTNMA54Z  114F TELEPORT COMMUNICATIONS AMERICA, LLC - TN 474   2020-08-27   
423-640 7 Sneedville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2021-06-25   
423-640 8 Sneedville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2021-01-11   
423-640 9 Sneedville TN KNVLTNMAYGX  7421 AT&T - LOCAL 474   2020-06-08   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.