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: 995

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-995 A Johnson City TN   321J HD CARRIER LLC 956   2026-01-22   
423-995 6 Johnson City TN   321J HD CARRIER LLC 956   2026-01-22   
423-995 7 Johnson City TN   321J HD CARRIER LLC 956   2026-01-22   
423-995 8 Johnson City TN   321J HD CARRIER LLC 956   2026-01-22   
423-995 9 Johnson City TN   321J HD CARRIER LLC 956   2026-01-22   

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

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