These entries are queried from radb.net using whois, you can try my project getting these.
:AS45991 route: 1.201.0.0/21 descr: KAKAO origin: AS45991 mnt-by: MAINT-AS9957 changed: noc [at] kinx.net 20121105 #00:58:45Z source: RADB last-modified: 2023-11-13T15:44:28Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 1.201.7.0/24 descr: KAKAO origin: AS45991 mnt-by: MAINT-AS9957 changed: noc [at] kinx.net 20130806 #02:57:26Z source: RADB last-modified: 2023-11-13T15:45:33Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 103.246.56.0/22 descr: KINX-KAKAO origin: AS45991 mnt-by: MAINT-AS9957 changed: noc [at] kinx.net 20110822 #08:56:55Z source: RADB last-modified: 2023-11-13T15:41:21Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 103.246.56.0/24 descr: KAKAO origin: AS45991 mnt-by: MAINT-AS4766 changed: nw [at] kornet.net 20130107 source: RADB last-modified: 2023-11-13T16:15:45Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 110.76.140.0/22 descr: KINX-Iwilab origin: AS45991 mnt-by: MAINT-AS9957 changed: noc [at] kinx.net 20110119 #08:33:10Z source: RADB last-modified: 2023-11-13T15:41:15Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 121.53.212.0/22 origin: AS45991 descr: KAKAO Corp. mnt-by: MAINT-AS10158 changed: netops [at] kakaocorp.com 20220203 #05:38:44Z source: RADB last-modified: 2023-11-13T16:09:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.238.180.0/24 descr: KAKAO origin: AS45991 mnt-by: MAINT-AS4766 changed: nw [at] kornet.net 20130107 source: RADB last-modified: 2023-11-13T16:15:45Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.246.172.0/24 descr: KAKAO origin: AS45991 mnt-by: MAINT-AS4766 changed: nw [at] kornet.net 20130107 source: RADB last-modified: 2023-11-13T16:15:45Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.248.0/21 descr: KAKAO Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] daumkakao.com 20141205 #08:59:05Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.248.0/22 descr: KAKAO Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] kakaocorp.com 20151210 #04:49:00Z source: RADB last-modified: 2023-11-13T15:48:29Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.248.0/24 descr: KAKAO Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] daumkakao.com 20141205 #07:59:45Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.249.0/24 descr: Kakao Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] kakaocorp.com 20151028 #08:49:48Z source: RADB last-modified: 2023-11-13T15:48:25Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.250.0/24 descr: KAKAO Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] daumkakao.com 20141205 #08:04:22Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.251.0/24 descr: KAKAO Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] daumkakao.com 20141205 #08:06:52Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.252.0/24 descr: KAKAO Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] daumkakao.com 20141205 #08:16:02Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.103.255.0/24 descr: KAKAO Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] daumkakao.com 20141205 #08:18:34Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2404:4600:7::/48 descr: Kakao Corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] kakaocorp.com 20160415 #04:55:58Z source: RADB last-modified: 2023-11-13T15:49:06Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2404:4600:4a::/48 descr: kakao corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] kakaocorp.com 20160323 #08:17:15Z source: RADB last-modified: 2023-11-13T15:48:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2404:4600:fce::/48 descr: kakao corp. origin: AS45991 mnt-by: MAINT-AS10158 changed: netops [at] kakaocorp.com 20160323 #08:22:59Z source: RADB last-modified: 2023-11-13T15:48:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source