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: CHCGILIDXDX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
224-380 A Plato Center IL 624H ONVOY SPECTRUM, LLC 358      
224-598 A Des Plaines IL 624H ONVOY SPECTRUM, LLC 358   2024-05-16   
224-604 A Elgin IL 624H ONVOY SPECTRUM, LLC 358   2024-05-16   
224-606 A Wauconda IL 624H ONVOY SPECTRUM, LLC 358   2024-05-17   
224-850 A Cary IL 624H ONVOY SPECTRUM, LLC 358      
312-708 A Chicago Zone 01-Calumet IL 624H ONVOY SPECTRUM, LLC 358   2024-04-24   
312-773 A Chicago Zone 01-Calumet IL 624H ONVOY SPECTRUM, LLC 358      
331-292 A Downers Grove IL 624H ONVOY SPECTRUM, LLC 358      
331-313 A Naperville IL 624H ONVOY SPECTRUM, LLC 358      
331-325 A Lemont IL 624H ONVOY SPECTRUM, LLC 358   2024-05-24   
331-631 A Downers Grove IL 624H ONVOY SPECTRUM, LLC 358      
464-244 A Bellwood IL 624H ONVOY SPECTRUM, LLC 358   2024-05-24   
773-773 A Chicago Zone 09-South Chicago IL 624H ONVOY SPECTRUM, LLC 358      
779-388 A Crystal Lake IL 624H ONVOY SPECTRUM, LLC 358   2024-05-25   
779-391 A New Lenox IL 624H ONVOY SPECTRUM, LLC 358   2024-05-20   
779-392 A Oglesby IL 624H ONVOY SPECTRUM, LLC 358   2024-05-20   
779-393 A Watseka IL 624H ONVOY SPECTRUM, LLC 358   2024-06-02   
779-394 A Wellington IL 624H ONVOY SPECTRUM, LLC 358   2024-06-02   
872-283 A Chicago Zone 07-Stewart IL 624H ONVOY SPECTRUM, LLC 358      
872-306 A Chicago Zone 09-South Chicago IL 624H ONVOY SPECTRUM, LLC 358      
872-312 A Chicago Zone 02-Edgewater IL 624H ONVOY SPECTRUM, LLC 358   2024-05-15   
872-321 A Chicago Zone 05-Austin IL 624H ONVOY SPECTRUM, LLC 358      
872-322 A Chicago Zone 06-Kedzie IL 624H ONVOY SPECTRUM, LLC 358      
872-710 A Chicago Zone 01-Calumet IL 624H ONVOY SPECTRUM, LLC 358      
872-877 A Chicago Zone 04-Humboldt IL 624H ONVOY SPECTRUM, LLC 358      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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