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.

NPA: 517 [Rate centres in NPA 517] [Dial plan for NPA 517]

NXX: 907

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
517-907 A Clarklake MI MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-907 4 Clarklake MI MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-907 5 Clarklake MI LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2021-03-05   
517-907 6 Clarklake MI LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2021-03-05   
517-907 7 Clarklake MI MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-907 8 Clarklake MI LNNGMIMN00Z  624H ONVOY SPECTRUM, LLC 346   2021-06-17   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.