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: 604

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-604 A Etowah TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2024-01-15   
423-604 0 Etowah TN KNVNTNEC0MD  073H TELNYX LLC 474   2019-11-20   
423-604 1 Etowah TN KNVLTNMAY5X  073H TELNYX LLC 474   2021-03-21   
423-604 3 Etowah TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2019-10-13   
423-604 4 Etowah TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2019-10-13   
423-604 5 Etowah TN KNVLTNMA49Z  525E ONVOY, LLC - TN 474   2021-03-19   
423-604 6 Etowah TN KNVLTNMA54Z  114F TELEPORT COMMUNICATIONS AMERICA, LLC - TN 474   2021-01-04   
423-604 7 Etowah TN KNVNTNEC2MD  939H COMMIO, LLC 474   2021-10-09   
423-604 8 Etowah TN KNVLTNMA56Z  124F BANDWIDTH.COM CLEC, LLC - TN 474   2022-01-16   
423-604 9 Etowah TN KNVNTNEC2MD  939H COMMIO, LLC 474   2021-10-09   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.