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: 263

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-263 A Oakland: Alameda DA CA ALMDCA11DS0  9740 PACIFIC BELL 722      
510-263 0 Oakland: Alameda DA CA ALMDCA11DS0  9740 PACIFIC BELL 722      
510-263 1 Oakland: Alameda DA CA ALMDCA11DS0  9740 PACIFIC BELL 722      
510-263 2 Oakland: Alameda DA CA ALMDCA11DS0  9740 PACIFIC BELL 722      
510-263 3 Oakland: Alameda DA CA HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722   2005-09-15   
510-263 4 Oakland: Alameda DA CA ALMDCA11DS0  9740 PACIFIC BELL 722      
510-263 5 Oakland: Alameda DA CA HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722   2005-09-15   
510-263 6 Oakland: Alameda DA CA HYWRCA115MD  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 722   2005-09-15   
510-263 7 Oakland: Alameda DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2007-07-29   
510-263 8 Oakland: Alameda DA CA SNFCCA01XGX  516C AT&T CORP. 722   2006-06-30   
510-263 9 Oakland: Alameda DA CA OKLDCA03XOY  318J COMCAST IP PHONE, LLC 722   2010-04-29   

Last updated: Fri, 25 Jul 2025 03:21:23 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.