These entries are queried from radb.net using whois, you can try my project getting these.
:AS16489 route: 74.207.64.0/18 descr: Webster University origin: AS16489 mnt-by: MAINT-CHTR-WD changed: david.mccomber [at] chartercom.com 20120220 #21:45:10Z source: RADB last-modified: 2023-11-13T16:11:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 74.207.64.0/20 descr: Webster University origin: AS16489 notify: noc [at] webster.edu mnt-by: MNT-WEBSTE-6 changed: benh [at] webster.edu 20061114 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 74.207.64.0/21 descr: Webster University origin: AS16489 notify: noc [at] webster.edu mnt-by: MNT-WEBSTE-6 changed: benh [at] webster.edu 20061128 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 74.207.72.0/21 descr: Webster University origin: AS16489 notify: noc [at] webster.edu mnt-by: MNT-WEBSTE-6 changed: benh [at] webster.edu 20061128 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 74.207.80.0/20 descr: Webster University origin: AS16489 notify: noc [at] webster.edu mnt-by: MNT-WEBSTE-6 changed: benh [at] webster.edu 20061128 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.246.0.0/21 descr: Proxy registration to prevent harm from ARIN-NONAUTH shutdown origin: AS16489 mnt-by: MAINT-AS7034 changed: kennethfinnegan2007 [at] gmail.com 20220404 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source