These entries are queried from radb.net using whois, you can try my project getting these.
:AS15008 route: 216.238.16.0/20 descr: AISG origin: AS15008 mnt-by: MNT-AISG-4 changed: arin [at] aisgnet.com 20120127 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 216.238.16.0/20 descr: GlobalAccessNetworks origin: AS15008 mnt-by: MAINT-AS15008 changed: kfox [at] charger.global 20230825 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 216.238.24.0/24 descr: 216.238.24.0-telx-tie origin: AS15008 member-of: rs-aisg-216-238-24-0 mnt-by: MNT-AISG-4 changed: arin [at] aisgnet.com 20141020 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600::/32 descr: GlobalAccessNetworks origin: AS15008 mnt-by: MAINT-AS15008 changed: kfox [at] charger.global 20230825 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2605:a280::/32 descr: AISG-IPV6 origin: AS15008 mnt-by: MNT-AISG-4 changed: arin [at] aisgnet.com 20140829 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source