These entries are queried from radb.net using whois, you can try my project getting these.
:AS15258 route: 63.89.247.0/24 descr: Route for Palmnet - 1 origin: AS15258 mnt-by: PALMNET-MNT changed: Steve.Cordova [at] level3.com 20000421 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.90.12.0/24 origin: AS15258 descr: PROV remarks: Proxy object for AS15258 mnt-by: MAINT-AS22773 changed: cciatl-nocengineer [at] cox.com 20220513 source: RADB last-modified: 2023-11-13T16:11:05Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.90.13.0/24 origin: AS15258 descr: Proxy route object on behalf of Gilbane Building Company remarks: LOA is on file notify: smc [at] equinix.com mnt-by: MAINT-AS14609 changed: lisidoro [at] equinix.com 20231215 # 0932Z source: RADB last-modified: 2023-12-15T09:32:49Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.90.14.0/24 origin: AS15258 descr: Proxy route object on behalf of Gilbane Building Company remarks: LOA is on file. notify: smc [at] equinix.com mnt-by: MAINT-AS14609 changed: lisidoro [at] equinix.com 20231215 # 0933Z source: RADB last-modified: 2023-12-15T09:33:10Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 204.90.15.0/24 origin: AS15258 descr: Proxy route object on behalf of Gilbane Building Company remarks: LOA is on file notify: smc [at] equinix.com mnt-by: MAINT-AS14609 changed: ahashi [at] equinix.com 20231208 # 1543Z source: RADB last-modified: 2023-12-08T15:43:44Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source