These entries are queried from radb.net using whois, you can try my project getting these.
:AS16676 route: 8.18.161.0/24 origin: AS16676 descr: 209 W. Jackson Blvd. Suite 200 Chicago IL 60606 United States admin-c: EP352-ARIN tech-c: EP352-ARIN tech-c: SYSTE577-ARIN mnt-by: MNT-BARCHA created: 2021-02-24T15:29:54Z last-modified: 2021-02-24T15:29:54Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source