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: 618 [Rate centres in NPA 618] [Dial plan for NPA 618]

NXX: 266

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
618-266 A Dix IL KELLILKLRS0  9329 ILLINOIS BELL TEL CO 520      
618-266 0 Dix IL   075A DELTA COMMS, LLC DBA CLEARWAVE COMMUNICATIONS - IL 520   2007-06-08   
618-266 1 Dix IL   063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 520   2012-10-28   
618-266 2 Dix IL   224C ONVOY, LLC 520   2016-09-07   
618-266 3 Dix IL   224C ONVOY, LLC 520   2016-09-07   
618-266 4 Dix IL   073H TELNYX LLC 520   2018-07-24   
618-266 5 Dix IL   508J CENTURYLINK COMMUNICATIONS, LLC 520   2014-07-17   
618-266 6 Dix IL   9329 ILLINOIS BELL TEL CO 520      
618-266 7 Dix IL   9329 ILLINOIS BELL TEL CO 520      
618-266 8 Dix IL   224C ONVOY, LLC 520   2018-01-27   
618-266 9 Dix IL   9329 ILLINOIS BELL TEL CO 520      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.