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: 773 [Rate centres in NPA 773] [Dial plan for NPA 773]

NXX: 823

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
773-823 A Chicago Zone 06-Kedzie IL OKBRILOAXEX  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
773-823 0 Chicago Zone 06-Kedzie IL CHCGILGMDS7  6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2007-07-20   
773-823 1 Chicago Zone 06-Kedzie IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2007-01-27   
773-823 2 Chicago Zone 06-Kedzie IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2025-06-23   
773-823 3 Chicago Zone 06-Kedzie IL OKBRILOAXEX  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
773-823 4 Chicago Zone 06-Kedzie IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2018-06-10   
773-823 5 Chicago Zone 06-Kedzie IL CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2021-09-17   
773-823 6 Chicago Zone 06-Kedzie IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2006-06-02   
773-823 7 Chicago Zone 06-Kedzie IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2007-01-27   
773-823 8 Chicago Zone 06-Kedzie IL ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2021-10-11   
773-823 9 Chicago Zone 06-Kedzie IL CHCGILNEXJX  318J COMCAST IP PHONE, LLC 358   2007-01-27   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.