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: 259

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-259 A New Tazewell TN KNVLTNMA31Z  6278 UNITED STATES CELLULAR - TN 474      
423-259 0 New Tazewell TN KNVLTNMA31Z  6278 UNITED STATES CELLULAR - TN 474      
423-259 1 New Tazewell TN KNVLTNMA31Z  6278 UNITED STATES CELLULAR - TN 474      
423-259 2 New Tazewell TN KNVLTNMANMD  4806 LEVEL 3 COMMUNICATIONS, LLC - TN 474      
423-259 3 New Tazewell TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474      
423-259 4 New Tazewell TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474      
423-259 5 New Tazewell TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474      
423-259 6 New Tazewell TN KNVLTNMA54Z  114F TELEPORT COMMUNICATIONS AMERICA, LLC - TN 474      
423-259 8 New Tazewell TN KNVLTNMANMD  4806 LEVEL 3 COMMUNICATIONS, LLC - TN 474      
423-259 9 New Tazewell TN KNVLTNMAY8X  624H ONVOY SPECTRUM, LLC 474      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.