These entries are queried from radb.net using whois, you can try my project getting these.
:AS51894 route: 159.148.147.0/24 org: ORG-MA140-RIPE descr: MIKROTIKLS origin: AS51894 mnt-by: AS2588-MNT created: 2010-11-29T08:32:40Z last-modified: 2019-07-08T12:13:46Z 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: valid route: 159.148.172.0/24 descr: MIKROTIKLS origin: AS51894 mnt-by: LATNET-MNT created: 2010-11-29T08:32:40Z last-modified: 2010-11-29T08:32:40Z 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: valid route6: 2a02:610:7501::/48 descr: MIKROTIKLS origin: AS51894 mnt-by: LATNET-MNT created: 2011-06-17T11:31:26Z last-modified: 2011-06-17T11:31:26Z 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: valid