These entries are queried from radb.net using whois, you can try my project getting these.
:AS2705 route: 159.251.0.0/16 descr: Proxy Entry for BJC origin: AS2705 mnt-by: MAINT-CHTR-WD changed: steven.hurst [at] chartercom.com 20140620 #16:38:57Z source: RADB last-modified: 2023-11-13T16:11:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source