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.

San Mateo, CA

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

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
650-638 9   9740 PACIFIC BELL 722      
650-639 A SNFCCAMKX1X  9748 AMERICAN MESSAGING SERVICES, LLC 722      
650-642 A OKLDCA61DMD  6664 SPRINT SPECTRUM L.P. 722      
650-642 0   6664 SPRINT SPECTRUM L.P. 722      
650-642 1   6664 SPRINT SPECTRUM L.P. 722      
650-642 2   7262 XO CALIFORNIA, INC. 722   2012-08-14   
650-642 3   981E BANDWIDTH.COM CLEC, LLC - CA 722   2011-06-24   
650-642 4   6664 SPRINT SPECTRUM L.P. 722      
650-642 5   6664 SPRINT SPECTRUM L.P. 722      
650-642 6   6664 SPRINT SPECTRUM L.P. 722      
650-642 7   6664 SPRINT SPECTRUM L.P. 722      
650-642 8   6664 SPRINT SPECTRUM L.P. 722      
650-642 9   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2013-07-25   
650-645 A SNFCCAFJDS0  7145 TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO 722      
650-645 0   6010 NEW CINGULAR WIRELESS PCS, LLC 722   2013-08-16   
650-645 1   7453 U.S. TELEPACIFIC CORP. - CA 722   2007-03-11   
650-645 2   7145 TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO 722      
650-645 3   7453 U.S. TELEPACIFIC CORP. - CA 722   2007-03-11   
650-645 4   7145 TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO 722      
650-645 5   7145 TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO 722      
650-645 6   7453 U.S. TELEPACIFIC CORP. - CA 722   2007-03-11   
650-645 7   7453 U.S. TELEPACIFIC CORP. - CA 722   2007-03-11   
650-645 8   7145 TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO 722      
650-645 9   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2012-11-17   
650-653 A HYWRCAMCDS0  7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 0   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 1   6010 NEW CINGULAR WIRELESS PCS, LLC 722   2013-08-16   
650-653 2   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 3   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 4   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 5   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 6   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 7   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-653 8   649C ONVOY, LLC - CA 722   2009-12-20   
650-653 9   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
650-655 A SNMTCA11DS0  9740 PACIFIC BELL 722      
650-667 A SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722      
650-667 0   981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-10-21   
650-667 1   981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-10-21   
650-667 2   981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-10-21   
650-667 3   981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-10-21   
650-667 4   981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-10-21   
650-667 5   981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-10-21   
650-667 6   981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-10-21   
650-667 7   649C ONVOY, LLC - CA 722   2014-10-30   
650-667 8   649C ONVOY, LLC - CA 722   2014-10-30   
650-667 9   6010 NEW CINGULAR WIRELESS PCS, LLC 722   2014-10-18   
650-678 A FRFECABBCM0  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 722      
650-685 A BRLNCA01DS0  9740 PACIFIC BELL 722      
650-696 A BRLNCA01DS0  9740 PACIFIC BELL 722      

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

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.