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.

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 JHCYTNXCXNX  124F BANDWIDTH.COM CLEC, LLC - TN 956   2025-10-04   
423-997 0 Elizabethton TN JHCYTNXCXNX  124F BANDWIDTH.COM CLEC, LLC - TN 956   2025-10-04   
423-997 1 Elizabethton TN JHCYTNXCXNX  124F BANDWIDTH.COM CLEC, LLC - TN 956   2026-06-06   
423-997 5 Elizabethton TN   124F BANDWIDTH.COM CLEC, LLC - TN 956   2026-09-13   
423-997 7 Elizabethton TN   145J TERRA NOVA TELECOM INC. 956   2025-10-10   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.