These entries are queried from radb.net using whois, you can try my project getting these.
:AS31857 route: 66.117.64.0/21 descr: PTERA-V4-66 assigned by ARIN origin: AS31857 notify: hostmaster [at] ptera.net mnt-by: MNT-PTERA changed: hostmaster [at] ptera.net 20180926 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.136.150.0/24 origin: AS31857 descr: Proxy route for AS31857 mnt-by: MAINT-AS10835 changed: jeremy [at] vcn.com 20200312 #20:43:12Z source: RADB last-modified: 2023-11-13T16:00:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 216.229.183.0/24 descr: PTERA-V4-216 assigned by ARIN origin: AS31857 notify: hostmaster [at] ptera.net mnt-by: MNT-PTERA changed: hostmaster [at] ptera.net 20180926 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source