These entries are queried from radb.net using whois, you can try my project getting these.
:AS31908 route: 204.132.91.0/24 descr: Route for VONAGE PHI origin: AS31908 mnt-by: VONAGE-LEVEL3PHI-MNT changed: daniel.deleau [at] level3.com 20050921 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.132.91.0/24 descr: Vonage Holdings 23 Main St Holmdel, NJ 07333 USA origin: AS31908 mnt-by: MAINT-VONAGE changed: irr [at] vonage.com 20061219 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.132.91.0/24 descr: Vonage-Level3NYC-Route origin: AS31908 mnt-by: VONAGE-LEVEL3PHI-MNT changed: bgpadmin [at] vonage.com 20051223 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source