These entries are queried from radb.net using whois, you can try my project getting these.
:AS32764 route: 66.28.181.0/24 descr: AS32764 proxy-registered route by Cogent origin: AS32764 remarks: Proxy-registered route object remarks: for Cogent customer notify: neteng [at] cogentco.com mnt-by: MAINT-AS174 changed: neteng [at] cogentco.com 20041025 source: RADB last-modified: 2023-11-13T15:39:35Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.66.188.0/24 origin: AS32764 descr: Amazon EC2 Prefix mnt-by: MAINT-AS16509 source: radb changed: noc [at] amazon.com 20240312 #18:22:05 last-modified: 2024-03-12T18:22:07Z rpki-ov-state: valid route6: 2602:f98b:10::/48 origin: AS32764 descr: Amazon EC2 Prefix mnt-by: MAINT-AS16509 source: radb changed: noc [at] amazon.com 20240312 #18:22:35 last-modified: 2024-03-12T18:22:37Z rpki-ov-state: valid