These entries are queried from radb.net using whois, you can try my project getting these.
:AS-IVSTAR as-set: AS-IVSTAR descr: Ivstar Ltd Ases tech-c: DUMY-RIPE admin-c: DUMY-RIPE members: AS29588 members: AS57712 members: AS48610 mnt-by: MNT-Ivstar created: 2019-11-06T09:22:24Z last-modified: 2023-07-13T12:05:21Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: ****************************