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: 872

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
423-872 A Chattanooga TN CHTGTN12X7Y  475J CALLWORKS CORPORATION 472      
423-872 0 Chattanooga TN CHTGTNNSXMZ  624H ONVOY SPECTRUM, LLC 472   2023-08-15   
423-872 1 Chattanooga TN CHTGTN12X7Y  475J CALLWORKS CORPORATION 472   2023-07-14   
423-872 2 Chattanooga TN CHTGTNNSXKY  525E ONVOY, LLC - TN 472   2023-09-02   
423-872 3 Chattanooga TN CHTGTNNSXNZ  197D VONAGE AMERICA LLC 472   2023-10-13   
423-872 4 Chattanooga TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 472   2025-03-07   
423-872 5 Chattanooga TN   6673 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 472   2025-03-07   
423-872 6 Chattanooga TN CHTGTNNSXMZ  624H ONVOY SPECTRUM, LLC 472   2023-08-15   
423-872 7 Chattanooga TN CHTGTNNSXMZ  624H ONVOY SPECTRUM, LLC 472   2023-08-15   
423-872 8 Chattanooga TN CHTGTNNSXMZ  624H ONVOY SPECTRUM, LLC 472   2023-08-15   
423-872 9 Chattanooga TN CHTGTNNSXMZ  624H ONVOY SPECTRUM, LLC 472   2023-08-15   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.