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: CNLNMIMNRPA

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
586-427 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      
586-497 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      
586-754 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      
586-755 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      
586-756 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      
586-757 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      
586-758 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      
586-759 A Center Line MI 9323 MICHIGAN BELL TEL CO 340      

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

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