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: 521

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
559-521 A Del Rey CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-521 0 Del Rey CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-521 1 Del Rey CA   649C ONVOY, LLC - CA 728   2021-08-13   
559-521 2 Del Rey CA FRSNCA01XOY  649C ONVOY, LLC - CA 728   2006-05-21   
559-521 3 Del Rey CA FRSNCA01XNY  981E BANDWIDTH.COM CLEC, LLC - CA 728   2018-06-21   
559-521 5 Del Rey CA FRSOCAYM4MD  6529 T-MOBILE USA, INC. 728   2007-05-03   
559-521 6 Del Rey CA FRSNCA01XNY  981E BANDWIDTH.COM CLEC, LLC - CA 728   2015-08-14   
559-521 8 Del Rey CA FRSNCA01DS5  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 728   2020-04-09   
559-521 9 Del Rey CA   649C ONVOY, LLC - CA 728   2021-07-22   

Last updated: Fri, 23 Jul 2021 12:43:22 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.