These entries are queried from radb.net using whois, you can try my project getting these.
:AS-OPTIMANET as-set: AS-optimanet descr: Optima-Network-DAG members: AS41743 admin-c: DUMY-RIPE tech-c: DUMY-RIPE mnt-by: OPTIMASET-MNT created: 2014-01-30T18:23:41Z last-modified: 2020-02-06T15:42:17Z 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: ****************************