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: 540

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
323-540 A Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730      
323-540 0 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2006-07-23   
323-540 1 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2005-11-07   
323-540 2 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2005-11-07   
323-540 3 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2006-01-16   
323-540 4 Los Angeles: DA 03 CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2008-11-19   
323-540 5 Los Angeles: DA 03 CA LSANCAJWDS9  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2013-03-31   
323-540 6 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2005-12-31   
323-540 7 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2005-12-31   
323-540 8 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2005-12-31   
323-540 9 Los Angeles: DA 03 CA ELMNCAFIGT1  6529 T-MOBILE USA, INC. 730   2006-01-16   

Last updated: Wed, 01 Jun 2022 03:09:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.