These entries are queried from radb.net using whois, you can try my project getting these.
:AS16974 route: 63.99.128.0/21 descr: UUnet provided IP space origin: AS16974 notify: sw-ops [at] shockwave.com mnt-by: SHOCKWAVE-MNT changed: lamont [at] shockwave.com 20010525 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 63.99.128.0/21 descr: PNAP-SFO Shockwave.com origin: AS16974 mnt-by: MAINT-AS1828 changed: mvos [at] internap.com 20000906 source: RADB last-modified: 2023-11-13T16:14:12Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 63.251.52.0/24 descr: Level3 provided IP space origin: AS16974 notify: sw-ops [at] shockwave.com mnt-by: SHOCKWAVE-MNT changed: lamont [at] shockwave.com 20010525 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 64.154.214.0/23 descr: Route for Shockwave origin: AS16974 mnt-by: SHOCKWAVE-MNT changed: daniel.deleau [at] level3.com 20040519 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.233.190.0/24 origin: AS16974 descr: PHX remarks: Proxy object for AS16974 mnt-by: MAINT-AS22773 changed: cciatl-nocengineer [at] cox.com 20220513 source: RADB last-modified: 2023-11-13T16:11:05Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source