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: 399

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-399 A Fremont-Newark: Main DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2024-01-21   
510-399 0 Fremont-Newark: Main DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-07-07   
510-399 1 Fremont-Newark: Main DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-07-07   
510-399 2 Fremont-Newark: Main DA CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-07-07   
510-399 3 Fremont-Newark: Main DA CA HYWRCAMCDMD  6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 722   2016-08-24   
510-399 4 Fremont-Newark: Main DA CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2016-08-22   
510-399 5 Fremont-Newark: Main DA CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2016-08-22   
510-399 6 Fremont-Newark: Main DA CA   515J IP HORIZON LLC 722   2016-09-14   
510-399 7 Fremont-Newark: Main DA CA SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2016-09-15   
510-399 8 Fremont-Newark: Main DA CA OKLECAZVGT0  6529 T-MOBILE USA, INC. 722   2016-07-11   
510-399 9 Fremont-Newark: Main DA CA OKLECAZVGT0  6529 T-MOBILE USA, INC. 722   2016-07-11   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.