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: 421

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
323-421 A Los Angeles: DA 12 CA LSANCA15DS0  9740 PACIFIC BELL 730      
323-421 0 Los Angeles: DA 12 CA TRNECAGBGT3  6529 T-MOBILE USA, INC. 730   2014-12-01   
323-421 1 Los Angeles: DA 12 CA LSANCA15DS0  9740 PACIFIC BELL 730      
323-421 2 Los Angeles: DA 12 CA LSANCA15DS0  9740 PACIFIC BELL 730      
323-421 3 Los Angeles: DA 12 CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2016-11-19   
323-421 4 Los Angeles: DA 12 CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2013-09-21   
323-421 5 Los Angeles: DA 12 CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2022-08-11   
323-421 6 Los Angeles: DA 12 CA ANHMCA01XEY  516C AT&T CORP. 730   2015-06-23   
323-421 7 Los Angeles: DA 12 CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2018-04-02   
323-421 8 Los Angeles: DA 12 CA BLTNCAADPS2  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 730   2005-09-12   
323-421 9 Los Angeles: DA 12 CA BLTNCAADPS2  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 730   2005-09-12   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.