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: 421

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
559-421 A Fresno CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-421 0 Fresno CA FRSNCAQRAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 728      
559-421 1 Fresno CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-421 2 Fresno CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-421 3 Fresno CA FRSNCA0103Z  318J COMCAST IP PHONE, LLC 728      
559-421 4 Fresno CA FRSOCAYM4MD  6529 T-MOBILE USA, INC. 728      
559-421 5 Fresno CA FRSOCAYM4MD  6529 T-MOBILE USA, INC. 728      
559-421 6 Fresno CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-421 7 Fresno CA FRSNCA01XOY  649C ONVOY, LLC - CA 728      
559-421 8 Fresno CA FRSOCAYM4MD  6529 T-MOBILE USA, INC. 728      
559-421 9 Fresno CA FRSMCA150MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 728      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.