These entries are queried from radb.net using whois, you can try my project getting these.
:AS-MIXNET as-set: AS-MIXNET descr: MIXNET members: AS201872 members: AS-AIREXPRESS members: AS39666 tech-c: DUMY-RIPE admin-c: DUMY-RIPE mnt-by: MIXNET-MNT created: 2016-02-17T09:51:13Z last-modified: 2021-01-18T16:17:28Z 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: ****************************