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

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
858-886 7 La Jolla CA 516C AT&T CORP. 732   2010-04-06   
858-914 9 Rancho Santa Fe CA 516C AT&T CORP. 732   2016-09-30   
858-925 7 Del Mar CA 516C AT&T CORP. 732   2006-06-30   
858-987 0 San Diego: Linda Vista DA CA 516C AT&T CORP. 732   2015-05-15   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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