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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NPA: 423 [Rate centres in NPA 423] [Dial plan for NPA 423]

NXX: 688

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-688 A Sneedville TN KNVLTNMAY6X  073H TELNYX LLC 474      
423-688 0 Sneedville TN KNVLTNMAY6X  073H TELNYX LLC 474   2021-07-08   
423-688 9 Sneedville TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2022-06-24   

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

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