These entries are queried from radb.net using whois, you can try my project getting these.
:AS15350 route: 69.57.16.0/20 descr: OrgName: Algona Municipal Utilities OrgId: AMU-6 Address: 104 West Call Street Address: PO Box 10 City: Algona StateProv: IA PostalCode: 50511 Country: US origin: AS15350 mnt-by: MAINT-AS5056 changed: will.hughes [at] aureon.com 20181026 #18:30:09Z source: RADB last-modified: 2023-11-13T15:55:00Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source