These entries are queried from radb.net using whois, you can try my project getting these.
:AS21399 route: 63.208.195.0/24 descr: Akamai 8CC Route origin: AS21399 mnt-by: AKAMAI-MNT changed: jpayne [at] akamai.com 20030925 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 63.210.173.0/24 descr: Akamai route origin: AS21399 mnt-by: AKAMAI-MNT changed: lou.gilman [at] level3.com 20030115 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 64.157.40.192/26 descr: Akamai route origin: AS21399 mnt-by: AKAMAI-MNT changed: steve.cordova [at] level3.com 20030208 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 69.27.160.0/20 descr: Akamai - Anchor Route origin: AS21399 mnt-by: AKAM1-ALTDB-MNT changed: ablock [at] akamai.com 20081016 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 69.27.160.0/20 descr: Akamai - Anchor Route origin: AS21399 mnt-by: AKAMAI-MNT changed: ablock [at] akamai.com 20090619 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 118.214.0.0/15 descr: Akamai - Anchor Route origin: AS21399 mnt-by: AKAMAI-MNT changed: ablock [at] akamai.com 20080131 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 184.28.26.0/23 descr: Akamai Technologies. Multihoming Block admin-c: MU1-LEVEL3 tech-c: MU1-LEVEL3 origin: AS21399 mnt-by: MASERGY-MNT changed: tim.booth [at] masergy.com 20110317 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 184.214.32.0/20 descr: RELIANCE COMM. CUSTOMER - AKAMAI origin: AS21399 mnt-by: MAINT-AS18101 changed: ip.nnoc [at] relianceada.com 20081118 #06:21:42Z source: RADB last-modified: 2023-11-13T15:47:44Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2001:4878::/32 descr: Akamai Aggregate origin: AS21399 mnt-by: AKAM1-ALTDB-MNT changed: jpayne [at] akamai.com 20100112 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600:1404::/32 descr: Akamai Aggregate origin: AS21399 mnt-by: AKAM1-ALTDB-MNT changed: ablock [at] akamai.com 20100709 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600:1407::/48 descr: Akamai V6 origin: AS21399 mnt-by: AKAM1-ALTDB-MNT changed: marty [at] akamai.com 20101005 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2600:1409::/48 descr: Akamai V6 origin: AS21399 mnt-by: AKAM1-ALTDB-MNT changed: marty [at] akamai.com 20100910 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source