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: DIXNILXA4MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
779-255 A De Kalb IL 224C ONVOY, LLC 364      
779-404 A Rochelle IL 224C ONVOY, LLC 364   2024-08-29   
779-749 A Steward IL 224C ONVOY, LLC 364      
779-759 A Sycamore IL 224C ONVOY, LLC 364      
779-910 A De Kalb IL 224C ONVOY, LLC 364      
815-551 A Lanark IL 224C ONVOY, LLC 364      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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