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.

Switch: SNDGCA0242Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
442-204 A Vista CA 516C AT&T CORP. 732      
619-467 A La Mesa CA 516C AT&T CORP. 732      
619-737 A Chula Vista CA 516C AT&T CORP. 732      
619-826 A Dulzura CA 516C AT&T CORP. 732      
760-623 A Brawley CA 516C AT&T CORP. 732      
760-814 A Oceanside: Carlsbad DA CA 516C AT&T CORP. 732      
858-230 A La Jolla CA 516C AT&T CORP. 732      
858-280 A Del Mar CA 516C AT&T CORP. 732      
858-771 A Rancho Santa Fe CA 516C AT&T CORP. 732      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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