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: 997

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-997 A Elizabethton TN   124F BANDWIDTH.COM CLEC, LLC - TN 956   2025-10-04   
423-997 0 Elizabethton TN   124F BANDWIDTH.COM CLEC, LLC - TN 956   2025-10-04   
423-997 7 Elizabethton TN   145J TERRA NOVA TELECOM INC. 956   2025-10-10   

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

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