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: MDTPMICODS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
517-996 7 Williamston MI 3535 ACD TELECOM, INC. - MI 346      
517-997 A Charlotte MI 3535 ACD TELECOM, INC. - MI 346      
517-997 3 Charlotte MI 3535 ACD TELECOM, INC. - MI 346      
517-997 4 Charlotte MI 3535 ACD TELECOM, INC. - MI 346      
517-997 7 Charlotte MI 3535 ACD TELECOM, INC. - MI 346      
517-997 9 Charlotte MI 3535 ACD TELECOM, INC. - MI 346      
517-998 A Jackson MI 3535 ACD TELECOM, INC. - MI 346      
517-999 A Lansing MI 3535 ACD TELECOM, INC. - MI 346      

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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