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: 572

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-572 A Englewood TN KNVLTNMA31Z  6278 UNITED STATES CELLULAR - TN 474      
423-572 0 Englewood TN   6278 UNITED STATES CELLULAR - TN 474      
423-572 1 Englewood TN   6278 UNITED STATES CELLULAR - TN 474      
423-572 2 Englewood TN   6278 UNITED STATES CELLULAR - TN 474      
423-572 3 Englewood TN   145J TERRA NOVA TELECOM INC. 474   2025-08-10   
423-572 4 Englewood TN   829J PAETEC ITEL, LLC 474   2010-09-07   
423-572 5 Englewood TN   6278 UNITED STATES CELLULAR - TN 474   2025-05-12   
423-572 6 Englewood TN   525E ONVOY, LLC - TN 474   2021-10-25   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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