These entries are queried from radb.net using whois, you can try my project getting these.
:AS-BELNET as-set: AS-BELNET descr: BELNET AS Macro members: AS2611 members: AS15383 members: AS21239 members: AS31511 members: AS29216 members: AS8674 members: AS16326 members: AS35733 members: AS25344 members: AS42744 members: AS42165 members: AS1837 members: AS49046 members: AS199670 members: AS206458 members: AS62058 members: AS210227 members: AS203338 members: AS207562 members: AS213345 members: AS210358 members: AS213331 members: AS209226 members: AS-SMARTEYE tech-c: DUMY-RIPE admin-c: DUMY-RIPE mnt-by: BELNET-MNT created: 1970-01-01T00:00:00Z last-modified: 2023-10-24T08:31:24Z 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: ****************************