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: 818 [Rate centres in NPA 818] [Dial plan for NPA 818]

NXX: 357

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
818-357 A Northridge CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730      
818-357 0 Northridge CA   6529 T-MOBILE USA, INC. 730   2002-12-08   
818-357 1 Northridge CA   6529 T-MOBILE USA, INC. 730   2004-08-15   
818-357 2 Northridge CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2006-03-23   
818-357 3 Northridge CA   6529 T-MOBILE USA, INC. 730   2004-04-03   
818-357 4 Northridge CA   6529 T-MOBILE USA, INC. 730   2004-04-03   
818-357 5 Northridge CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2003-09-30   
818-357 6 Northridge CA   6529 T-MOBILE USA, INC. 730   2004-08-15   
818-357 7 Northridge CA   6529 T-MOBILE USA, INC. 730   2002-12-21   
818-357 8 Northridge CA   6529 T-MOBILE USA, INC. 730   2002-12-21   
818-357 9 Northridge CA   6529 T-MOBILE USA, INC. 730   2002-12-21   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.