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: 586 [Rate centres in NPA 586] [Dial plan for NPA 586]

NXX: 355

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
586-355 A Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
586-355 0 Richmond MI SFLDMITOEMD  495J STRATUS NETWORKS 340   2021-05-28   
586-355 1 Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-07-12   
586-355 2 Richmond MI   933G PEERLESS NETWORK OF MICHIGAN, LLC - MI 340   2026-04-24   
586-355 3 Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-03-07   
586-355 4 Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-03-07   
586-355 5 Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-03-07   
586-355 6 Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-03-07   
586-355 7 Richmond MI DTRTMIVWDMD  624H ONVOY SPECTRUM, LLC 340   2021-06-15   
586-355 8 Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-07-12   
586-355 9 Richmond MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-09-02   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.