These entries are queried from radb.net using whois, you can try my project getting these.
:AS607 route: 76.8.90.0/24 descr: RCN-CUSTOMER-NICO TRADING origin: AS607 mnt-by: MAINT-AS27506 changed: dataoperations [at] rcnmetro.com 20090724 #17:14:50Z source: RADB last-modified: 2023-11-13T15:42:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source