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: 336

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
323-336 A Los Angeles: DA 09 CA IRVECAEIDS0  7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 730      
323-336 0 Los Angeles: DA 09 CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-15   
323-336 1 Los Angeles: DA 09 CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-15   
323-336 2 Los Angeles: DA 09 CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-15   
323-336 3 Los Angeles: DA 09 CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-15   
323-336 4 Los Angeles: DA 09 CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-15   
323-336 5 Los Angeles: DA 09 CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-15   
323-336 6 Los Angeles: DA 09 CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2013-09-21   
323-336 7 Los Angeles: DA 09 CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2003-07-15   
323-336 8 Los Angeles: DA 09 CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2011-05-22   
323-336 9 Los Angeles: DA 09 CA IRVECAEIDS0  7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 730      

Last updated: Tue, 15 Jul 2025 18:46:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.