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: 323 [Rate centres in NPA 323] [Dial plan for NPA 323]

NXX: 638

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
323-638 A Los Angeles: DA 06 CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730      
323-638 0 Los Angeles: DA 06 CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730      
323-638 1 Los Angeles: DA 06 CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730      
323-638 2 Los Angeles: DA 06 CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730      
323-638 3 Los Angeles: DA 06 CA TRNECAGB7MD  899D METROPCS NETWORKS, LLC 730   2010-01-23   
323-638 4 Los Angeles: DA 06 CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2008-11-19   
323-638 5 Los Angeles: DA 06 CA LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2006-06-16   
323-638 6 Los Angeles: DA 06 CA TRNECAGB7MD  899D METROPCS NETWORKS, LLC 730   2009-03-02   
323-638 7 Los Angeles: DA 06 CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2008-11-19   
323-638 8 Los Angeles: DA 06 CA LSANCARCDS1  993B CURATEL, LLC - CA 730   2001-10-12   
323-638 9 Los Angeles: DA 06 CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2008-11-19   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.