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: LNNGMIMNX3Y

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-236 5 Dimondale MI 2550 123.NET, LLC 346   2017-12-18   
517-268 0 Holt MI 2550 123.NET, LLC 346      
517-283 8 Reading MI 2550 123.NET, LLC 346   2003-03-09   
517-441 2 Eaton Rapids MI 2550 123.NET, LLC 346   2009-03-21   
517-522 9 Grass Lake MI 2550 123.NET, LLC 346   2017-04-03   
517-531 2 Parma MI 2550 123.NET, LLC 346   2003-03-09   
517-544 A Jackson MI 2550 123.NET, LLC 346      
517-547 0 Addison MI 2550 123.NET, LLC 346   2003-03-09   
517-568 0 Homer MI 2550 123.NET, LLC 346   2003-03-09   
517-584 A Albion MI 2550 123.NET, LLC 346      
517-609 A Jonesville MI 2550 123.NET, LLC 346      
517-626 8 Grand Ledge MI 2550 123.NET, LLC 346   2010-05-15   
517-642 A Munith MI 2550 123.NET, LLC 346      
517-668 7 De Witt MI 2550 123.NET, LLC 346   2005-02-27   
517-679 A Lansing MI 2550 123.NET, LLC 346      
517-726 8 Vermontville MI 2550 123.NET, LLC 346   2017-02-24   
517-732 A Portland MI 2550 123.NET, LLC 346      
517-732 0 Portland MI 2550 123.NET, LLC 346      
517-742 4 Holt MI 2550 123.NET, LLC 346   2009-03-13   
517-762 A Dansville MI 2550 123.NET, LLC 346      
517-785 A Onondaga MI 2550 123.NET, LLC 346      
517-828 A Hillsdale MI 2550 123.NET, LLC 346      
517-852 7 Nashville MI 2550 123.NET, LLC 346   2015-09-04   
517-873 A Charlotte MI 2550 123.NET, LLC 346      
517-883 9 Mason MI 2550 123.NET, LLC 346   2011-06-13   
517-992 A Williamston MI 2550 123.NET, LLC 346      
517-992 0 Williamston MI 2550 123.NET, LLC 346   2003-04-20   

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

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