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.

Switch: JHCYTNXCX1Y

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
423-226 7 Church Hill TN 508J CENTURYLINK COMMUNICATIONS, LLC 956   2014-04-19   
423-270 7 Erwin TN 508J CENTURYLINK COMMUNICATIONS, LLC 956   2014-04-19   
423-398 7 Kingsport TN 508J CENTURYLINK COMMUNICATIONS, LLC 956   2014-04-19   
423-491 A Johnson City TN 508J CENTURYLINK COMMUNICATIONS, LLC 956      
423-491 7 Johnson City TN 508J CENTURYLINK COMMUNICATIONS, LLC 956   2013-11-01   
423-797 7 Bristol TN 508J CENTURYLINK COMMUNICATIONS, LLC 956   2014-04-19   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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