These entries are queried from radb.net using whois, you can try my project getting these.
:AS20189 route: 23.194.128.0/24 descr: Akamai Technologies origin: AS20189 mnt-by: MNT-AKAMAI source: ARIN changed: ip-admin [at] akamai.com 20200304 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 23.209.101.0/24 descr: Akamai Technologies origin: AS20189 mnt-by: AKAM1-ALTDB-MNT changed: ip-admin [at] akamai.com 20190910 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 23.214.114.0/24 descr: Akamai Technologies origin: AS20189 mnt-by: AKAM1-ALTDB-MNT changed: ip-admin [at] akamai.com 20180626 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 104.75.12.0/24 descr: Akamai Technologies origin: AS20189 mnt-by: MNT-AKAMAI source: ARIN changed: ip-admin [at] akamai.com 20200227 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600:1406:11::/48 descr: Akamai Technologies origin: AS20189 mnt-by: AKAM1-ALTDB-MNT changed: ip-admin [at] akamai.com 20120226 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600:1406:14::/48 descr: Akamai Technologies origin: AS20189 mnt-by: AKAM1-ALTDB-MNT changed: ip-admin [at] akamai.com 20120226 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600:1406:15::/48 descr: Akamai Technologies origin: AS20189 mnt-by: AKAM1-ALTDB-MNT changed: ip-admin [at] akamai.com 20120226 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600:1406:18::/48 descr: Akamai Technologies origin: AS20189 mnt-by: AKAM1-ALTDB-MNT changed: ip-admin [at] akamai.com 20120305 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source