These entries are queried from radb.net using whois, you can try my project getting these.
:AS41452 route: 89.164.90.0/24 descr: Zracna luka Zagreb d.o.o. descr: Zagreb Airport, CROATIA origin: AS41452 mnt-by: ISKON created: 2006-08-23T12:07:56Z last-modified: 2006-08-23T12:07:56Z 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: **************************** rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source