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: 431

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-431 A La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 0 La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 1 La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 2 La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 3 La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 4 La Jolla CA SNDJCA05DS3  7262 XO CALIFORNIA, INC. 732   2005-09-22   
858-431 5 La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 6 La Jolla CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732   2005-09-25   
858-431 7 La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 8 La Jolla CA SNDGCA07DS1  7421 AT&T - LOCAL 732      
858-431 9 La Jolla CA SNDICAETAMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2005-10-09   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.