These entries are queried from radb.net using whois, you can try my project getting these.
:AS31975 route: 152.97.0.0/18 origin: AS31975 descr: Proxy for The University of the South mnt-by: MAINT-BENLOMAND-WJH changed: johamby [at] benlomand.net 20220303 source: NTTCOM last-modified: 2022-03-03T21:03:21Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 152.97.0.0/18 origin: AS31975 descr: Proxy Entry For The University of the South mnt-by: MAINT-AS21766 changed: johamby [at] benlomand.net 20220303 #17:07:58Z source: RADB last-modified: 2023-11-13T16:09:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 152.97.29.0/24 origin: AS31975 descr: Proxy Entry For The University of the South mnt-by: MAINT-BENLOMAND-WJH changed: johamby [at] benlomand.net 20200520 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 152.97.29.0/24 origin: AS31975 descr: Proxy Entry for The University of the South mnt-by: MAINT-AS21766 changed: johamby [at] benlomand.net 20200520 #17:01:45Z source: RADB last-modified: 2023-11-13T16:00:41Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source