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: 280

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
858-280 A Del Mar CA SNDGCA0242Z  516C AT&T CORP. 732      
858-280 0 Del Mar CA   649C ONVOY, LLC - CA 732   2016-11-12   
858-280 1 Del Mar CA   6010 NEW CINGULAR WIRELESS PCS, LLC 732   2016-11-10   
858-280 2 Del Mar CA   649C ONVOY, LLC - CA 732   2017-03-17   
858-280 3 Del Mar CA   073H TELNYX LLC 732   2017-03-24   
858-280 4 Del Mar CA   6529 T-MOBILE USA, INC. 732   2017-04-09   
858-280 5 Del Mar CA   6529 T-MOBILE USA, INC. 732   2017-02-09   
858-280 6 Del Mar CA   6529 T-MOBILE USA, INC. 732   2016-12-09   
858-280 7 Del Mar CA   516C AT&T CORP. 732   2016-09-07   
858-280 8 Del Mar CA   576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 732   2016-09-30   
858-280 9 Del Mar CA   6529 T-MOBILE USA, INC. 732   2016-09-11   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.