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: 666

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-666 A La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732      
858-666 0 La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732   2012-12-30   
858-666 1 La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732   2012-12-30   
858-666 2 La Jolla CA SNDGCA0284Z  4733 PAETEC COMMUNICATIONS, INC. - CA 732   2013-02-15   
858-666 3 La Jolla CA SNDGCA0284Z  4733 PAETEC COMMUNICATIONS, INC. - CA 732   2013-02-15   
858-666 4 La Jolla CA SNDGCA0284Z  4733 PAETEC COMMUNICATIONS, INC. - CA 732   2013-02-15   
858-666 5 La Jolla CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732   2013-03-16   
858-666 6 La Jolla CA SNDGCAJWDS0  649C ONVOY, LLC - CA 732   2012-11-17   
858-666 7 La Jolla CA SNDGCA51CM3  6010 NEW CINGULAR WIRELESS PCS, LLC 732   2013-03-16   
858-666 8 La Jolla CA SNDGCA02XSZ  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 732   2013-04-01   
858-666 9 La Jolla CA SNDGCA02XSZ  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 732   2013-04-01   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.