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: 531

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
517-531 A Parma MI PARMMIXJDS0  0681 FRONTIER MIDSTATES, INC. - MI 346      
517-531 0 Parma MI   318J COMCAST IP PHONE, LLC 346   2007-03-07   
517-531 1 Parma MI   0681 FRONTIER MIDSTATES, INC. - MI 346      
517-531 2 Parma MI   2550 123.NET, LLC 346   2003-03-09   
517-531 3 Parma MI   0681 FRONTIER MIDSTATES, INC. - MI 346      
517-531 4 Parma MI   0681 FRONTIER MIDSTATES, INC. - MI 346      
517-531 5 Parma MI   0681 FRONTIER MIDSTATES, INC. - MI 346      
517-531 6 Parma MI   543C ONVOY, LLCV - MI 346   2007-03-09   
517-531 7 Parma MI   0681 FRONTIER MIDSTATES, INC. - MI 346      
517-531 8 Parma MI   0681 FRONTIER MIDSTATES, INC. - MI 346      
517-531 9 Parma MI   145J TERRA NOVA TELECOM INC. 346   2025-05-31   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.