These entries are queried from radb.net using whois, you can try my project getting these.
:AS24290 route: 203.174.88.0/21 descr: Heart Network Co.,LTD origin: AS24290 notify: hnw-adm [at] hearts.ne.jp mnt-by: MAINT-AS24290 changed: hnw-adm [at] hearts.ne.jp 20060820 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.174.88.0/21 descr: HEARTNET origin: AS24290 notify: stcn-adm [at] stnet.ad.jp mnt-by: MAINT-AS7522 changed: stcn-adm [at] stnet.ad.jp 20240401 source: JPIRR rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.174.88.0/21 descr: HEARTNET origin: AS24290 notify: stcn-adm [at] stnet.ad.jp mnt-by: MAINT-AS7522 changed: stcn-adm [at] stnet.ad.jp 20060828 #17:23:47(UTC) 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: 203.175.16.0/20 descr: Heart Network Co.,LTD origin: AS24290 notify: hnw-adm [at] hearts.ne.jp mnt-by: MAINT-AS24290 changed: hnw-adm [at] hearts.ne.jp 20060820 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.175.16.0/20 descr: HEARTNET origin: AS24290 notify: stcn-adm [at] stnet.ad.jp mnt-by: MAINT-AS7522 changed: stcn-adm [at] stnet.ad.jp 20240401 source: JPIRR rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 203.175.16.0/20 descr: HEARTNET origin: AS24290 notify: stcn-adm [at] stnet.ad.jp mnt-by: MAINT-AS7522 changed: stcn-adm [at] stnet.ad.jp 20060828 #17:14:27(UTC) source: RADB last-modified: 2023-11-13T15:39:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source