These entries are queried from radb.net using whois, you can try my project getting these.
:AS18226 route: 23.40.252.0/22 descr: Akamai Technologies origin: AS18226 mnt-by: MNT-AKAMAI source: ARIN changed: ip-admin [at] akamai.com 20191014 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source