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-Hyde Park, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
773-955 4 CHCGILDODS0  9329 ILLINOIS BELL TEL CO 358      
773-955 5 CHCGILDODS0  9329 ILLINOIS BELL TEL CO 358      
773-955 6 CHCGILDODS0  9329 ILLINOIS BELL TEL CO 358      
773-955 7 CHCGILDODS0  9329 ILLINOIS BELL TEL CO 358      
773-955 8 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2021-11-15   
773-955 9 CHCGILDODS0  9329 ILLINOIS BELL TEL CO 358      

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Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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