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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Switch: JHCYTNXCX0Y

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
423-430 A Johnson City TN 551G NUSO, LLC 956      
423-430 1 Johnson City TN 551G NUSO, LLC 956   2013-05-08   
423-524 A Johnson City TN 551G NUSO, LLC 956      
423-524 1 Johnson City TN 551G NUSO, LLC 956   2018-04-08   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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