These entries are queried from radb.net using whois, you can try my project getting these.
:AS31821 route: 198.62.116.0/24 origin: AS31821 descr: Riverdale Country School 5250 Fieldston Road Bronx NY 10471 United States member-of: RS-RCS-AS31821 admin-c: KINGJ18-ARIN tech-c: KINGJ18-ARIN mnt-by: MNT-RCS-6 created: 2023-10-05T19:21:31Z last-modified: 2023-10-05T19:22:38Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.51.176.0/20 descr: US Signal downstream customer origin: AS31821 mnt-by: MAINT-AS26554 changed: noc [at] ussignalcom.com 20120215 #22:30:14Z source: RADB last-modified: 2023-11-13T15:42:03Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source