These entries are queried from radb.net using whois, you can try my project getting these.
:AS4723 route: 61.122.64.0/19 descr: DOLPHIN CIDR BLOCK 5(AS4723) 2236 Katakura-cho Hachioji,Tokyo 192 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.ad.jp 20010124 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 175.100.208.0/20 descr: DOLPHIN CIDR BLOCK 2(AS4723) 2236 Katakura-cho Hachioji,Tokyo 192-0914 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.ad.jp 20100107 #06:42:25Z source: RADB last-modified: 2023-11-13T15:40:33Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 175.100.224.0/19 descr: DOLPHIN CIDR BLOCK 2(AS4723) 2236 Katakura-cho Hachioji,Tokyo 192-0914 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.ad.jp 20100107 #06:41:33Z source: RADB last-modified: 2023-11-13T15:40:33Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.222.224.0/19 descr: DOLPHIN INTERNET 2236 Katakura-cho Hachioji,Tokyo 192-0914 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.or.jp 20060427 source: RADB last-modified: 2023-11-13T15:39:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.135.64.0/19 descr: DOLPHIN CIDR BLOCK 1(AS4723) 2236 Katakura-Cho Hachioji Tokyo 192 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.or.jp 19970406 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.173.224.0/19 descr: DOLPHIN CIDR BLOCK 2(AS4723) 2236 Katakura-cho Hachioji,Tokyo 192 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.or.jp 19980811 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 210.189.96.0/19 descr: DOLPHIN CIDR BLOCK 3(AS4723) 2236 Katakura-cho Hachioji,Tokyo 192 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.or.jp 20000506 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 211.132.16.0/20 descr: DOLPHIN CIDR BLOCK 4(AS4723) 2236 Katakura-cho Hachioji,Tokyo 192 Japan origin: AS4723 mnt-by: MAINT-AS4723 changed: yumura [at] din.ad.jp 20001014 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source