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: 559 [Rate centres in NPA 559] [Dial plan for NPA 559]

NXX: 851

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
559-851 A Huron CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-851 0 Huron CA   649C ONVOY, LLC - CA 728      
559-851 1 Huron CA   649C ONVOY, LLC - CA 728      
559-851 2 Huron CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 728   2024-09-19   
559-851 3 Huron CA   649C ONVOY, LLC - CA 728      
559-851 4 Huron CA   649C ONVOY, LLC - CA 728      
559-851 5 Huron CA   981E BANDWIDTH.COM CLEC, LLC - CA 728   2009-02-24   
559-851 6 Huron CA   624H ONVOY SPECTRUM, LLC 728   2021-11-01   
559-851 7 Huron CA   624H ONVOY SPECTRUM, LLC 728   2021-11-01   
559-851 8 Huron CA   624H ONVOY SPECTRUM, LLC 728   2021-07-23   
559-851 9 Huron CA   318J COMCAST IP PHONE, LLC 728   2023-02-12   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.