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: LNNGMIMNXJY

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-226 A Lansing MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-251 A Lansing MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-255 A Lansing MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-360 A Lansing MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-390 A Jackson MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-407 A Jonesville MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-464 A Jackson MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-794 A Lansing MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-804 A Fowlerville MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      
517-973 A Charlotte MI 9748 AMERICAN MESSAGING SERVICES, LLC 346      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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