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: 657 [Rate centres in NPA 657] [Dial plan for NPA 657]

NXX: 579

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
657-579 A Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 0 Orange CA LSANCAJWRMD  026K BARR TELL USA, LLC 730      
657-579 1 Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 2 Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 3 Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 4 Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 5 Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 6 Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 7 Orange CA GRDNCA02KMD  7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
657-579 8 Orange CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730      
657-579 9 Orange CA BLTNCAADGMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.