These entries are queried from radb.net using whois, you can try my project getting these.
:AS2513 route: 160.74.0.0/16 descr: JSTNET Japan Science and Technology Agency X-Keiro : k2.gr [at] jst.go.jp origin: AS2513 mnt-by: MAINT-AS2513 changed: k2.gr [at] jst.go.jp 20230401 source: JPIRR rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 160.74.0.0/16 descr: JSTNET Japan Science and Technology Agency 5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666 JAPAN origin: AS2513 mnt-by: MAINT-AS7684 changed: peer [at] sakura.ad.jp 20150320 source: RADB last-modified: 2023-11-13T15:47:20Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 202.250.252.0/24 descr: JSTNET Japan Science and Technology Agency X-Keiro : k2.gr [at] jst.go.jp origin: AS2513 mnt-by: MAINT-AS2513 changed: k2.gr [at] jst.go.jp 20230401 source: JPIRR rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 202.250.252.0/24 descr: JSTNET Japan Science and Technology Agency 5-3, Yonbancho, Chiyoda-ku, Tokyo 102-8666 JAPAN origin: AS2513 mnt-by: MAINT-AS7684 changed: peer [at] sakura.ad.jp 20150320 source: RADB last-modified: 2023-11-13T15:47:20Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source