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.

Cambria, MI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
517-357 A CMBAMIXJRSA  4417 FRONTIER COMMUNICATIONS OF MICHIGAN, INC. 346      
517-946 A MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-946 2 LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2021-08-15   
517-946 3 MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-946 4 LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2018-10-12   
517-946 6 LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2021-07-11   

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.