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.

Switch: OKLDCA03XOY

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 >>

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
650-376 3 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2006-10-17   
650-379 8 South San Francisco CA 318J COMCAST IP PHONE, LLC 722   2020-04-09   
650-383 5 Los Altos CA 318J COMCAST IP PHONE, LLC 722      
650-386 1 Mountain View CA 318J COMCAST IP PHONE, LLC 722   2008-04-24   
650-386 5 Mountain View CA 318J COMCAST IP PHONE, LLC 722      
650-386 6 Mountain View CA 318J COMCAST IP PHONE, LLC 722      
650-389 2 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2012-12-11   
650-389 6 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2011-08-05   
650-389 7 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2011-09-30   
650-391 9 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2007-10-14   
650-392 0 South San Francisco CA 318J COMCAST IP PHONE, LLC 722   2014-06-27   
650-393 4 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2007-05-26   
650-393 5 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2007-05-26   
650-394 4 San Carlos-Belmont CA 318J COMCAST IP PHONE, LLC 722   2008-02-27   
650-394 8 San Carlos-Belmont CA 318J COMCAST IP PHONE, LLC 722   2011-10-01   
650-397 5 Los Altos CA 318J COMCAST IP PHONE, LLC 722   2011-10-03   
650-405 6 Los Altos CA 318J COMCAST IP PHONE, LLC 722   2019-05-09   
650-410 5 South San Francisco CA 318J COMCAST IP PHONE, LLC 722   2017-05-15   
650-419 6 La Honda CA 318J COMCAST IP PHONE, LLC 722   2010-10-22   
650-435 5 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2015-04-03   
650-437 2 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2014-05-02   
650-445 7 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2013-10-30   
650-453 3 San Carlos-Belmont CA 318J COMCAST IP PHONE, LLC 722   2011-03-24   
650-477 2 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2008-04-24   
650-485 2 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2009-10-01   
650-486 1 San Carlos-Belmont CA 318J COMCAST IP PHONE, LLC 722   2009-12-05   
650-488 0 San Francisco: Juniper DA CA 318J COMCAST IP PHONE, LLC 722      
650-494 4 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2011-09-15   
650-503 8 Redwood City CA 318J COMCAST IP PHONE, LLC 722   2016-05-23   
650-513 1 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2008-09-19   
650-513 6 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2012-08-06   
650-521 A Palo Alto CA 318J COMCAST IP PHONE, LLC 722      
650-521 0 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2005-09-25   
650-530 2 Woodside CA 318J COMCAST IP PHONE, LLC 722      
650-537 4 Mountain View CA 318J COMCAST IP PHONE, LLC 722   2013-08-11   
650-549 8 Redwood City CA 318J COMCAST IP PHONE, LLC 722   2014-08-08   
650-550 4 San Francisco: Juniper DA CA 318J COMCAST IP PHONE, LLC 722   2011-09-15   
650-560 8 Half Moon Bay CA 318J COMCAST IP PHONE, LLC 722   2010-04-23   
650-561 3 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2006-11-02   
650-561 4 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2006-11-02   
650-562 7 Redwood City CA 318J COMCAST IP PHONE, LLC 722   2013-04-26   
650-563 4 Moss Beach CA 318J COMCAST IP PHONE, LLC 722   2010-04-23   
650-581 1 San Mateo CA 318J COMCAST IP PHONE, LLC 722      
650-584 3 Mountain View CA 318J COMCAST IP PHONE, LLC 722   2010-06-11   
650-600 8 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2013-01-11   
650-622 4 San Carlos-Belmont CA 318J COMCAST IP PHONE, LLC 722   2014-08-08   
650-627 4 San Mateo CA 318J COMCAST IP PHONE, LLC 722   2009-04-24   
650-651 7 Millbrae CA 318J COMCAST IP PHONE, LLC 722   2013-01-23   
650-656 9 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2014-06-29   
650-665 7 Palo Alto CA 318J COMCAST IP PHONE, LLC 722   2014-10-26   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 >>

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.