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: LNNGMIMNX5Z

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-997 0 Charlotte MI 543C ONVOY, LLCV - MI 346   2016-03-28   
517-997 1 Charlotte MI 543C ONVOY, LLCV - MI 346   2016-03-28   
517-997 5 Charlotte MI 543C ONVOY, LLCV - MI 346   2013-01-30   
517-997 8 Charlotte MI 543C ONVOY, LLCV - MI 346   2014-11-13   

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Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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