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 07-Oakland, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
773-896 9 BNSVILDGDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 358      
773-924 A CHCGILOKDS0  9329 ILLINOIS BELL TEL CO 358      

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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