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: 830

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-830 A Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 0 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 1 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 2 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 3 Kingsport TN JHCYTNXCX3X  7278 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - TN 956      
423-830 4 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 5 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 6 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 7 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 8 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      
423-830 9 Kingsport TN JHCYTNXCXPX  525E ONVOY, LLC - TN 956      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.