These entries are queried from radb.net using whois, you can try my project getting these.
:AS-INTERSPACE as-set: AS-INTERSPACE descr: Interspace and customers ASNs and AS-SETs descr: The list contains ASs routed by Interspace remarks: remarks: --------- Interspace primary ASN ---------------------- members: AS5581 members: AS200899 remarks: --------- Interspace secondary ASNs ------------------- members: AS57340 members: AS60613 members: AS61057 remarks: --------- Downstream ASNs and AS-SETs ----------------- remarks: @ C1230 members: AS56620 remarks: --- remarks: @ C1267 members: AS5379 remarks: --- remarks: @ T-AS members: AS205119 remarks: --- remarks: @ C1449 members: AS200412 remarks: -- remarks: @ C1421 members: AS49056 remarks: --- remarks: @ C142-NEW members: AS211450 remarks: --- remarks: @ C1514 members: AS42133 remarks: --- remarks: @ C1286 members: AS204031 remarks: --- remarks: @ C1271 members: AS9119 remarks: ----------------------------------------------- remarks: tech-c: DUMY-RIPE admin-c: DUMY-RIPE mnt-by: INTERSPACE-MNT created: 2016-12-01T18:03:00Z last-modified: 2021-12-20T09:23:11Z 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: ****************************