These entries are queried from radb.net using whois, you can try my project getting these.
:AS131898 route: 219.100.146.0/24 descr: Yahoo Japan Corporation X-keiro: route-admin [at] mail.yahoo.co.jp origin: AS131898 notify: route-admin [at] mail.yahoo.co.jp mnt-by: MAINT-AS131898 changed: route-admin [at] mail.yahoo.co.jp 20240305 source: JPIRR rpki-ov-state: valid