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: 858 [Rate centres in NPA 858] [Dial plan for NPA 858]

NXX: 375

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-375 A Poway CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732      
858-375 1 Poway CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732   2011-09-18   
858-375 3 Poway CA   6010 NEW CINGULAR WIRELESS PCS, LLC 732   2013-08-30   
858-375 4 Poway CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732   2003-03-22   
858-375 5 Poway CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732   2005-01-14   
858-375 6 Poway CA   981E BANDWIDTH.COM CLEC, LLC - CA 732   2011-05-28   
858-375 7 Poway CA   7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 732   2003-11-26   
858-375 8 Poway CA   6010 NEW CINGULAR WIRELESS PCS, LLC 732   2013-08-30   
858-375 9 Poway CA   981E BANDWIDTH.COM CLEC, LLC - CA 732   2015-05-16   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.