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.

Chicago Zone 11-O'Hare, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
872-873 3 CHCGIL24DS6  224C ONVOY, LLC 358   2020-07-25   
872-873 4 CHCGIL24DS6  224C ONVOY, LLC 358   2020-07-25   
872-873 5 CHCGIL24DS6  224C ONVOY, LLC 358   2020-07-25   
872-873 6 CHCGILWUDS4  063E PEERLESS NETWORK OF ILLINOIS, LLC - IL 358   2020-10-26   
872-873 7 CHCGILIDXEX  553J WHITESKY COMMUNICATIONS, LLC 358   2021-02-27   
872-873 8 CHCGIL245MD  073H TELNYX LLC 358   2021-01-17   
872-873 9 CHCGIL24XMD  495J STRATUS NETWORKS 358   2020-09-20   

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Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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