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: 991

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
517-991 A Camden MI MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-991 0 Camden MI LNNGMIMN00Z  624H ONVOY SPECTRUM, LLC 346   2024-05-03   
517-991 1 Camden MI LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2018-10-12   
517-991 2 Camden MI LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2021-07-11   
517-991 3 Camden MI MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-991 4 Camden MI LNNGMIMNX8Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 346   2016-02-15   
517-991 5 Camden MI LNNGMIMN17Z  792K CHARTER IP ENABLED SERVICES, LLC 346   2024-10-20   
517-991 7 Camden MI LNNGMIMNXQZ  508J CENTURYLINK COMMUNICATIONS, LLC 346   2016-01-23   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.