These entries are queried from radb.net using whois, you can try my project getting these.
:AS397531 route: 67.218.8.0/23 descr: Iowa Data Centers 22068 Business Hwy 151, Monticello, IA 52310 origin: AS397531 notify: joel [at] infrastructuretech.net mnt-by: MNT-ITSL-8 changed: joel [at] infrastructuretech.net 20190725 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source