These entries are queried from radb.net using whois, you can try my project getting these.
:AS15070 route: 208.50.44.0/23 descr: TheFind block origin: AS15070 notify: ipadmin [at] thefind.com mnt-by: MAINT-THEFIND changed: ipadmin [at] thefind.com 20070320 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.83.152.0/21 descr: TheFind block origin: AS15070 notify: ipadmin [at] thefind.com mnt-by: MAINT-THEFIND changed: ipadmin [at] thefind.com 20071106 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source