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: 203

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-203 A La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732      
858-203 0 La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732      
858-203 1 La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732      
858-203 2 La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732      
858-203 3 La Jolla CA SNDGCA0241Z  576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 732      
858-203 4 La Jolla CA SNDGCA0268Z  318J COMCAST IP PHONE, LLC 732      
858-203 5 La Jolla CA SNDICAETAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732      
858-203 6 La Jolla CA SNDACAGLDS2  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732      
858-203 7 La Jolla CA SNDGCA0241Z  576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 732      
858-203 8 La Jolla CA ESCNCAKYGT0  6529 T-MOBILE USA, INC. 732      
858-203 9 La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.