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.

Fremont-Newark: Oliver DA, CA

<< 1 2 3 4 5 6 7 8 9 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
510-668 7 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-668 8 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-668 9 SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2024-10-19   
510-683 A FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 0 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 1 SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2014-03-23   
510-683 2 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 3 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 4 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 5 SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2014-10-26   
510-683 6 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 7 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 8 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-683 9 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-687 A FRMTCA12DS0  9740 PACIFIC BELL 722      
510-738 A SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722      
510-738 0 SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2016-10-17   
510-738 1 SNJUCACL3MD  073H TELNYX LLC 722   2017-06-12   
510-738 2 SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2017-12-01   
510-738 3 SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2017-12-01   
510-738 4 SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2019-03-02   
510-738 5 FRMTCAJYDS0  707H INTEGRATED PATH COMMUNICATIONS, LLC - CA 722   2018-07-13   
510-738 6 SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2019-03-02   
510-738 7 SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2018-12-13   
510-738 8 SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2018-05-16   
510-738 9 SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2018-01-22   
510-743 A HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 0 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 1 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 2 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 3 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 4 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 5 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 6 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 7 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 8 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-743 9 HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722      
510-770 A FRMTCA12DS0  9740 PACIFIC BELL 722      
510-770 0 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-770 1 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-770 2 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-770 3 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-770 4 SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2014-06-26   
510-770 5 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-770 6 SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2012-04-19   
510-770 7 SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2022-12-17   
510-770 8 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-770 9 FRMTCA12DS0  9740 PACIFIC BELL 722      
510-771 A HYWRCAMCDS0  7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 722      
510-771 0 HYWRCAMCDS0  7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 722      

<< 1 2 3 4 5 6 7 8 9 >>

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.