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.

Switch: DNSNILXCRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
217-537 A Donnellson IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 976      
217-537 0 Donnellson IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 976      
217-537 1 Donnellson IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 976      
217-537 3 Donnellson IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 976      
217-537 4 Donnellson IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 976      
217-537 9 Donnellson IL 1183 CITIZENS TELECOM CO ILLINOIS-FRONTIER CITIZENS -IL 976      

Last updated: Sat, 04 Jul 2026 13:07:56 UTC

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