These entries are queried from radb.net using whois, you can try my project getting these.
:AS20366 route: 8.8.31.0/24 descr: LinkedIn/Level3 2029 Stierlin Ct Mountain View, CA 94043 origin: AS20366 mnt-by: MAINT-AS20049 changed: zali [at] linkedin.com 20131117 #08:06:00Z source: RADB last-modified: 2023-11-13T15:45:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 8.18.31.0/24 descr: LinkedIn/Level3 2029 Stierlin Ct Mountain View, CA 94043 origin: AS20366 mnt-by: MAINT-AS20049 changed: zali [at] linkedin.com 20131118 #06:47:24Z source: RADB last-modified: 2023-11-13T15:45:54Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source