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: LNNGMIMNX4Z

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-992 1 Williamston MI 6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2004-12-31   
517-994 8 Portland MI 6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2009-09-26   
517-996 0 Williamston MI 6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2020-11-08   
517-996 2 Williamston MI 6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2009-09-26   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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