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.
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Switch: DWNSILXDRS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
309-378 A Downs IL 1015 FRONTIER NORTH, INC. - IL 366      
309-378 1 Downs IL 1015 FRONTIER NORTH, INC. - IL 366      
309-378 2 Downs IL 1015 FRONTIER NORTH, INC. - IL 366      
309-378 3 Downs IL 1015 FRONTIER NORTH, INC. - IL 366      
309-378 4 Downs IL 1015 FRONTIER NORTH, INC. - IL 366      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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