These entries are queried from radb.net using whois, you can try my project getting these.
:AS15138 route: 38.117.21.0/24 descr: AS15138 proxy-registered route by Cogent origin: AS15138 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: 64.244.8.0/24 descr: BGP-Filter-Update origin: AS15138 mnt-by: ASPENTX-MNT changed: tejnder.panesar [at] alpheuscommunications.com 20081008 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.48.180.0/24 descr: AS15138 proxy-registered route by Cogent origin: AS15138 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: 2023-11-13T15:39:36Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source