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: 701

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-701 A Robbins TN KNVLTNMA31Z  6278 UNITED STATES CELLULAR - TN 474      
423-701 0 Robbins TN KNVLTNMA31Z  6278 UNITED STATES CELLULAR - TN 474   2014-03-30   
423-701 1 Robbins TN KNVLTNMA31Z  6278 UNITED STATES CELLULAR - TN 474   2016-04-01   
423-701 2 Robbins TN KNVLTNMAYHX  318J COMCAST IP PHONE, LLC 474   2024-06-13   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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