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.

Fitchburg, MI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
517-565 A FTBGMIXIRSA  0681 FRONTIER MIDSTATES, INC. - MI 346      
517-565 0   6120 LEVEL 3 COMMUNICATIONS, LLC - MI 346   2006-01-05   
517-565 3   0681 FRONTIER MIDSTATES, INC. - MI 346      
517-565 4   6120 LEVEL 3 COMMUNICATIONS, LLC - MI 346   2004-07-16   
517-565 7   543C ONVOY, LLC - MI 346   2013-04-01   
517-634 A LNNGMIDCDS0  4632 TELNET WORLDWIDE, INC. 346      
517-923 A MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-923 2   543C ONVOY, LLC - MI 346   2020-02-10   
517-923 3   543C ONVOY, LLC - MI 346   2020-02-10   
517-923 4   3535 ACD TELECOM, INC. - MI 346      
517-923 6   7575 CENTURYLINK COMMUNICATIONS LLC 346   2016-01-25   
517-923 7   3535 ACD TELECOM, INC. - MI 346      

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.