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: 972

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-972 A Fremont-Newark: Greenleaf DA CA OKLDCA03XOY  318J COMCAST IP PHONE, LLC 722      
510-972 0 Fremont-Newark: Greenleaf DA CA OKLDCA03XOY  318J COMCAST IP PHONE, LLC 722      
510-972 1 Fremont-Newark: Greenleaf DA CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2011-06-02   
510-972 2 Fremont-Newark: Greenleaf DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2013-03-28   
510-972 3 Fremont-Newark: Greenleaf DA CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2011-02-06   
510-972 4 Fremont-Newark: Greenleaf DA CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2008-11-20   
510-972 5 Fremont-Newark: Greenleaf DA CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2014-07-20   
510-972 6 Fremont-Newark: Greenleaf DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2007-09-07   
510-972 7 Fremont-Newark: Greenleaf DA CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2005-09-17   
510-972 8 Fremont-Newark: Greenleaf DA CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2011-05-22   
510-972 9 Fremont-Newark: Greenleaf DA CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2012-02-19   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.