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.

Diamond Bar, CA

1 2 3 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
840-240 A COVNCAXFX3Y  649C ONVOY, LLC - CA 730      
840-240 0 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-10-30   
840-240 1 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 2 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 3 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 4 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-01-23   
840-240 5 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 6 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 7 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 8 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2023-03-02   
840-240 9 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2023-09-22   
840-244 A RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730      
840-244 0 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2024-02-22   
840-244 1 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2024-02-22   
840-244 2 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2024-02-22   
840-244 3 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2024-02-22   
840-244 4 LSANCAJWHMD  145J TERRA NOVA TELECOM INC. 730   2024-02-02   
840-244 5 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2024-02-23   
840-244 6 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2024-02-23   
840-244 7 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2024-02-23   
840-244 8 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2023-12-17   
840-244 9 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2023-12-17   
840-588 A LSANCAJWIMD  965H FRACTEL, LLC 730      
840-588 0 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2022-01-21   
840-588 1 LSANCA543MD  073H TELNYX LLC 730   2022-06-16   
840-588 2 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2022-08-25   
840-588 3 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2022-07-29   
840-588 4 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2022-07-29   
840-588 5 RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-12-28   
840-588 6 RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-12-28   
840-588 7 RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2021-12-28   
840-588 8 LSANCAJWIMD  965H FRACTEL, LLC 730   2021-12-27   
840-588 9 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2022-03-11   
909-274 A NRWLCA141MD  776C CHARTER FIBERLINK CA-CCO, LLC - CA 730      
909-274 0 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2010-02-27   
909-274 1 LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2009-12-09   
909-274 2 NRWLCA141MD  776C CHARTER FIBERLINK CA-CCO, LLC - CA 730   2009-10-19   
909-274 3 LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2009-12-09   
909-274 4 NRWLCA141MD  776C CHARTER FIBERLINK CA-CCO, LLC - CA 730   2009-10-19   
909-274 5 NRWLCA141MD  776C CHARTER FIBERLINK CA-CCO, LLC - CA 730   2009-10-19   
909-274 6 NRWLCA141MD  776C CHARTER FIBERLINK CA-CCO, LLC - CA 730   2009-10-19   
909-274 7 COVNCAXFXUX  576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 730   2009-08-31   
909-274 8 RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2010-07-11   
909-274 9 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2010-02-27   
909-323 A COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2024-01-23   
909-323 0 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-08-08   
909-323 1 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-08-08   
909-323 2 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2016-08-27   
909-323 3 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-06-18   
909-323 4 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-06-18   
909-323 5 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-10-01   
909-323 6 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-10-01   
909-323 7 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-06-10   
909-323 8 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2016-06-10   
909-323 9 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2016-09-23   
909-345 A LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730      
909-345 0 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2012-09-20   
909-345 1 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2012-09-21   
909-345 2 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2013-03-08   
909-345 3 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2013-07-15   
909-345 4 RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2014-09-11   
909-345 5 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2012-12-31   
909-345 6 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2012-12-31   
909-345 7 COVNCAXFXUX  576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 730   2013-08-22   
909-345 8 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2012-12-31   
909-345 9 LSANCAJWDS9  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2013-04-13   
909-348 A ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730      
909-348 0 IRVNCASM1MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730   2000-12-27   
909-348 1 ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730      
909-348 2 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2005-09-16   
909-348 3 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2005-09-16   
909-348 4 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2007-11-19   
909-348 5 IRVNCASM1MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730   2004-02-15   
909-348 6 RILTCA11DS0  7480 PACIFIC BELL (COMPETITIVE) 730   2006-01-14   
909-348 7 LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2004-12-17   
909-348 8 ANHMCANG2MD  4733 PAETEC COMMUNICATIONS, INC. - CA 730   2009-03-27   
909-348 9 LSAJCAWZ7MD  4733 PAETEC COMMUNICATIONS, INC. - CA 730   2002-06-17   
909-378 A IRVECAEIDS2  7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 730      
909-378 0 RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2014-04-11   
909-378 1 RILTCA11DS0  7480 PACIFIC BELL (COMPETITIVE) 730   2013-11-12   
909-378 2 IRVNCASM1MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 730   2013-09-17   
909-378 3 LSANCA54DS7  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 730   2014-03-23   
909-378 4 IRVECAEIDS2  7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 730   2013-09-14   
909-378 5 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2014-07-18   
909-378 6 LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2014-07-18   
909-378 7 ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730   2013-09-17   
909-378 8 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2013-11-30   
909-378 9 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2013-11-30   
909-396 A DMBRCAXF86M  2319 FRONTIER CALIFORNIA INC. 730      
909-444 A WLNTCAXFDS0  2319 FRONTIER CALIFORNIA INC. 730      
909-468 A WLNTCAXFDS0  2319 FRONTIER CALIFORNIA INC. 730      
909-551 A COVNCAXFXUX  576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 730      
909-551 0 COVNCAXFXUX  576C TIME WARNER CBL INFO SVCS (CA) DBA TIME WARNER CAB 730   2014-12-15   
909-551 1 RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2014-12-16   
909-551 2 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2014-12-23   
909-551 3 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2014-12-23   
909-551 4 COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2014-12-23   
909-551 5 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2015-05-15   
909-551 6 RVSDCAYAGT1  6529 T-MOBILE USA, INC. 730   2015-05-15   
909-551 7 ANHMCANG2MD  4733 PAETEC COMMUNICATIONS, INC. - CA 730   2015-01-02   

1 2 3 >>

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.