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: 939

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
510-939 A Hercules-Rodeo CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722      
510-939 0 Hercules-Rodeo CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2015-05-23   
510-939 1 Hercules-Rodeo CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2015-05-23   
510-939 2 Hercules-Rodeo CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-02-24   
510-939 3 Hercules-Rodeo CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-02-24   
510-939 4 Hercules-Rodeo CA OKLECAZV1MD  6529 T-MOBILE USA, INC. 722   2016-07-06   
510-939 5 Hercules-Rodeo CA   515J IP HORIZON LLC 722   2016-09-14   
510-939 6 Hercules-Rodeo CA SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2016-09-17   
510-939 7 Hercules-Rodeo CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-02-15   
510-939 8 Hercules-Rodeo CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-03-25   
510-939 9 Hercules-Rodeo CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2016-02-17   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.