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: 908

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-908 A Surgoinsville TN KNVOTNTN0MD  939H COMMIO, LLC 474   2024-03-14   
423-908 0 Surgoinsville TN KNVNTNEC2MD  939H COMMIO, LLC 474   2024-03-14   
423-908 1 Surgoinsville TN KNVNTNEC2MD  939H COMMIO, LLC 474   2024-03-14   

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

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