These entries are queried from radb.net using whois, you can try my project getting these.
:AS38646 route: 203.178.8.0/24 descr: Tokyo6to4 Project origin: AS38646 notify: noc [at] tokyo6to4.net mnt-by: MAINT-AS2500 changed: kato [at] wide.ad.jp 20100105 source: RADB last-modified: 2023-11-13T15:40:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source