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.

Los Angeles: DA 03, CA

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
323-999 6 LSANCAJWDS9  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2016-12-08   
323-999 7 ANHMCA01XEY  516C AT&T CORP. 730   2006-06-30   
323-999 8 TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2007-05-02   
323-999 9 LSANCARCD3S  649C ONVOY, LLC - CA 730   2011-05-22   

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Last updated: Sun, 01 Jun 2025 02:18:11 UTC

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