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: 771

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-771 A Fremont-Newark: Oliver DA CA HYWRCAMCDS0  7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
510-771 0 Fremont-Newark: Oliver DA CA HYWRCAMCDS0  7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
510-771 1 Fremont-Newark: Oliver DA CA HYWRCAMCDS0  7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
510-771 2 Fremont-Newark: Oliver DA CA HYWRCAMCDS0  7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
510-771 3 Fremont-Newark: Oliver DA CA HYWRCAMCDS0  7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
510-771 4 Fremont-Newark: Oliver DA CA SNFCCA01GT0  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2014-06-26   
510-771 5 Fremont-Newark: Oliver DA CA OKLDCAMPDS0  4733 PAETEC COMMUNICATIONS, INC. - CA 722   2010-11-04   
510-771 6 Fremont-Newark: Oliver DA CA HYWRCAMCDS0  7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722      
510-771 7 Fremont-Newark: Oliver DA CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2008-11-20   
510-771 8 Fremont-Newark: Oliver DA CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2012-01-15   
510-771 9 Fremont-Newark: Oliver DA CA OKLDCA03XOY  318J COMCAST IP PHONE LLC 722   2015-01-06   

Last updated: Sun, 07 Feb 2021 01:52:50 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.