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: 510 [Rate centres in NPA 510] [Dial plan for NPA 510]

NXX: 214

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-214 A Oakland: Alameda DA CA HYWRCAMCDS0  7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 722      
510-214 0 Oakland: Alameda DA CA   7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 722      
510-214 1 Oakland: Alameda DA CA   7240 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 722      
510-214 2 Oakland: Alameda DA CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2009-11-21   
510-214 3 Oakland: Alameda DA CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2009-11-21   
510-214 4 Oakland: Alameda DA CA   649C ONVOY, LLC - CA 722   2004-04-08   
510-214 5 Oakland: Alameda DA CA   649C ONVOY, LLC - CA 722   2008-03-22   
510-214 6 Oakland: Alameda DA CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2009-11-21   
510-214 7 Oakland: Alameda DA CA   649C ONVOY, LLC - CA 722   2009-01-14   
510-214 8 Oakland: Alameda DA CA   515J IP HORIZON LLC 722   2003-10-12   
510-214 9 Oakland: Alameda DA CA   145J TERRA NOVA TELECOM INC. 722   2021-04-28   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.