These entries are queried from radb.net using whois, you can try my project getting these.
:AS20291 route: 216.251.50.0/24 descr: PNAP-SFF infosys origin: AS20291 mnt-by: MAINT-AS1828 changed: schester [at] internap.com 20010518 source: RADB last-modified: 2023-11-13T16:13:52Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2602:ff6d::/36 descr: 3T Systems Ltd descr: Suite 323, 180-235 Vermillion Road descr: Winnipeg, MB R2J 3M7 descr: CA origin: AS20291 mnt-by: MNT-TSL-212 changed: internet.operations [at] 3tsystems.net 20190307 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2602:ff6d::/37 descr: 3T Systems Ltd descr: Suite 323, 180-235 Vermillion Road descr: Winnipeg, MB R2J 3M7 descr: CA origin: AS20291 mnt-by: MNT-TSL-212 changed: internet.operations [at] 3tsystems.net 20190307 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2602:ff6d:800::/37 descr: 3T Systems Ltd descr: Suite 323, 180-235 Vermillion Road descr: Winnipeg, MB R2J 3M7 descr: CA origin: AS20291 mnt-by: MNT-TSL-212 changed: internet.operations [at] 3tsystems.net 20190307 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source