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: CHCGILWUVMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
224-646 2 Northbrook IL 321J HD CARRIER LLC 358   2025-10-10   
224-664 7 Des Plaines IL 321J HD CARRIER LLC 358   2026-03-08   
224-664 8 Des Plaines IL 321J HD CARRIER LLC 358   2026-03-08   
224-664 9 Des Plaines IL 321J HD CARRIER LLC 358   2026-03-08   
312-473 9 Chicago Zone 01-Calumet IL 321J HD CARRIER LLC 358   2025-10-11   
312-879 1 Chicago Zone 01-Canal IL 321J HD CARRIER LLC 358   2025-10-11   
331-342 2 Naperville IL 321J HD CARRIER LLC 358   2026-03-08   
331-342 3 Naperville IL 321J HD CARRIER LLC 358   2026-03-08   
331-342 4 Naperville IL 321J HD CARRIER LLC 358   2026-03-08   
331-837 6 West Chicago IL 321J HD CARRIER LLC 358   2025-10-10   
630-763 3 Elmhurst IL 321J HD CARRIER LLC 358   2025-10-10   
773-204 3 Chicago Zone 07-Stewart IL 321J HD CARRIER LLC 358   2025-10-10   
773-740 4 Chicago Zone 02-Edgewater IL 321J HD CARRIER LLC 358   2025-10-04   
773-903 3 Chicago Zone 06-Kedzie IL 321J HD CARRIER LLC 358   2025-10-10   
872-268 A Chicago Zone 01-Calumet IL 321J HD CARRIER LLC 358      
872-268 9 Chicago Zone 01-Calumet IL 321J HD CARRIER LLC 358   2020-10-09   
872-340 2 Chicago Zone 04-Humboldt IL 321J HD CARRIER LLC 358   2023-11-30   
872-363 6 Chicago Zone 05-Austin IL 321J HD CARRIER LLC 358   2025-10-11   
872-363 7 Chicago Zone 05-Austin IL 321J HD CARRIER LLC 358   2025-10-11   
872-385 5 Chicago Zone 09-South Chicago IL 321J HD CARRIER LLC 358   2025-10-10   
872-799 A Chicago Zone 10-Beverly IL 321J HD CARRIER LLC 358   2025-11-07   
872-799 9 Chicago Zone 10-Beverly IL 321J HD CARRIER LLC 358   2025-11-07   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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