These entries are queried from radb.net using whois, you can try my project getting these.
:AS1224 route: 141.142.0.0/16 descr: NCSA origin: AS1224 mnt-by: MAINT-NTTCOM-RA changed: boudreat [at] eng.verio.net 20070413 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 141.142.0.0/16 origin: AS1224 descr: University of Illinois National Center for Supercomputing Applications admin-c: PWI34 tech-c: PWI34 mnt-by: MAINT-AS38 changed: iccn-ops-l [at] listserv.illinois.edu 20230207 #13:45:52Z source: RADB last-modified: 2023-11-13T16:14:55Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.17.196.0/24 descr: University of Illinois National Center for Supercomputing Applications origin: AS1224 mnt-by: MAINT-AS38 changed: net-trouble [at] illinois.edu 20161118 #19:52:21Z source: RADB last-modified: 2023-11-13T15:49:57Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.17.196.0/25 descr: NCSA IPv4 origin: AS1224 mnt-by: MAINT-AS38 changed: net-trouble [at] illinois.edu 20161201 #19:15:19Z source: RADB last-modified: 2023-11-13T15:50:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:0:c80::/48 descr: NCSA IPv6 Allocation origin: AS1224 mnt-by: MAINT-AS38 changed: net-trouble [at] uiuc.edu 20121017 #20:12:48Z source: RADB last-modified: 2023-11-13T15:43:27Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source