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: 257

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-257 A La Jolla CA SNDACAGLDS2  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732      
858-257 0 La Jolla CA SNDGCA02XIZ  981E BANDWIDTH.COM CLEC, LLC - CA 732      
858-257 1 La Jolla CA SNDGCA02XIZ  981E BANDWIDTH.COM CLEC, LLC - CA 732      
858-257 2 La Jolla CA SNDACAGLDS2  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732      
858-257 3 La Jolla CA SNDACAGLDS2  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732      
858-257 4 La Jolla CA SNDACAGLDS2  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 732      
858-257 5 La Jolla CA SNDGCA0284Z  4733 PAETEC COMMUNICATIONS, INC. - CA 732      
858-257 6 La Jolla CA SNDICAETAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732      
858-257 7 La Jolla CA ESCNCAKYGT0  6529 T-MOBILE USA, INC. 732      
858-257 8 La Jolla CA ESCNCAKYGT0  6529 T-MOBILE USA, INC. 732      
858-257 9 La Jolla CA ESCNCAKYGT0  6529 T-MOBILE USA, INC. 732      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.