These entries are queried from radb.net using whois, you can try my project getting these.
:AS40947 route: 208.91.52.0/22 descr: FRANKLIN OLIN SCHOOL OF ENGINEERING origin: AS40947 mnt-by: MAINT-AS27506 changed: rmaddula [at] lightower.com 20180518 source: RADB last-modified: 2023-11-13T15:53:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source