These entries are queried from radb.net using whois, you can try my project getting these.
:AS31909 route: 63.77.214.0/24 descr: Vonage Holdings 23 Main St Holmdel, NJ 07333 USA origin: AS31909 mnt-by: MAINT-VONAGE changed: irr [at] vonage.com 20061113 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 63.77.214.0/24 descr: Denver-Level3-RouteObject02 origin: AS31909 mnt-by: VONAGE-DENVER-MNT changed: bgpadmin [at] vonage.com 20040609 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 66.238.180.0/24 descr: Vonage Holdings 23 Main St Holmdel, NJ 07333 USA origin: AS31909 mnt-by: MAINT-VONAGE changed: irr [at] vonage.com 20061113 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 66.238.180.0/24 descr: Denver-Level3-RouteObject01 origin: AS31909 mnt-by: VONAGE-DENVER-MNT changed: bgpadmin [at] vonage.com 20040609 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source