These entries are queried from radb.net using whois, you can try my project getting these.
:AS17599 route: 203.229.241.0/24 descr: Yuhan University origin: AS17599 mnt-by: MAINT-AS4766 changed: chss93 [at] kornet.net 20050228 #10:20:37(UTC) source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.229.242.0/24 descr: Yuhan University origin: AS17599 mnt-by: MAINT-AS4766 changed: chss93 [at] kornet.net 20050228 #10:21:37(UTC) source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.229.252.0/23 descr: Yuhan University origin: AS17599 mnt-by: MAINT-AS4766 changed: chss93 [at] kornet.net 20050228 #10:23:33(UTC) source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.234.44.0/22 descr: Yuhan College origin: AS17599 mnt-by: MAINT-AS4766 changed: grant96 [at] kornet.net 20060203 source: RADB last-modified: 2023-11-13T16:15:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.206.199.0/24 origin: AS17599 descr: AS17599 mnt-by: MAINT-AS9318 changed: noc [at] skbroadband.com 20190103 #08:41:57Z source: RADB last-modified: 2023-11-13T15:55:23Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 220.66.9.0/24 descr: Yuhan University origin: AS17599 mnt-by: MAINT-AS4766 changed: chss93 [at] kornet.net 20050228 #10:25:31(UTC) source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 220.66.10.0/24 descr: Yuhan University origin: AS17599 mnt-by: MAINT-AS4766 changed: chss93 [at] kornet.net 20050228 #10:26:25(UTC) source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 220.149.32.0/22 descr: Yuhan University origin: AS17599 mnt-by: MAINT-AS4766 changed: chss93 [at] kornet.net 20050228 #10:27:18(UTC) source: RADB last-modified: 2023-11-13T16:15:42Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source