These entries are queried from radb.net using whois, you can try my project getting these.
:AS4751 route: 60.55.0.0/16 descr: Temporary Obj for CNC-H origin: AS4751 notify: ops [at] ntt.net mnt-by: MAINT-NTTCOM-BB changed: naoki [at] ntt.net 20040823 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source