These entries are queried from radb.net using whois, you can try my project getting these.
:AS59098 route: 103.149.4.0/23 descr: Kuriyama-Network X-Keiro:abuse [at] kuriyama-net.org origin: AS59098 notify: noc [at] kuriyama-net.org mnt-by: MAINT-AS150362 changed: noc [at] kuriyama-net.org 20240316 source: JPIRR rpki-ov-state: valid route6: 2400:f7a0::/32 descr: Kuriyama-Network X-Keiro:abuse [at] kuriyama-net.org origin: AS59098 notify: noc [at] kuriyama-net.org mnt-by: MAINT-AS150362 changed: noc [at] kuriyama-net.org 20240316 source: JPIRR rpki-ov-state: valid route6: 2400:f7a0:7479::/48 descr: Kuriyama-Network HE X-Keiro:abuse [at] kuriyama-net.org origin: AS59098 notify: noc [at] kuriyama-net.org mnt-by: MAINT-AS150362 changed: noc [at] kuriyama-net.org 20240316 source: JPIRR rpki-ov-state: valid