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: 742

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
559-742 A Riverdale CA FRSMCA150MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 728      
559-742 0 Riverdale CA   981E BANDWIDTH.COM CLEC, LLC - CA 728      
559-742 1 Riverdale CA   624H ONVOY SPECTRUM, LLC 728   2024-01-03   
559-742 2 Riverdale CA   649C ONVOY, LLC - CA 728      
559-742 3 Riverdale CA   145J TERRA NOVA TELECOM INC. 728   2025-10-16   
559-742 4 Riverdale CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 728   2005-08-02   
559-742 7 Riverdale CA   145J TERRA NOVA TELECOM INC. 728   2024-12-30   
559-742 8 Riverdale CA   649C ONVOY, LLC - CA 728   2019-02-24   
559-742 9 Riverdale CA   649C ONVOY, LLC - CA 728   2019-02-24   

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.