These entries are queried from radb.net using whois, you can try my project getting these.
:AS9877 route6: 2402:a900::/32 origin: AS9877 descr: (proxy-registered route object) Ngee Ann Polytechnic address: Computer Centre Ngee Ann Polytechnic, Singapore 2159 country: SG phone: +65 460 6769 e-mail: wbs [at] np.edu.sg mnt-by: MAINT-AS17547 changed: iskandarb [at] m1.com.sg 20190828 #03:56:08Z source: RADB last-modified: 2023-11-13T15:57:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source