These entries are queried from radb.net using whois, you can try my project getting these.
:AS64490 route: 31.148.50.0/24 origin: AS64490 mnt-by: RIPE-DB-MNT mnt-by: MNT-LANNET-LVIV created: 2022-02-10T10:08:18Z last-modified: 2022-02-10T10:08:18Z 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: 31.148.51.0/24 origin: AS64490 mnt-by: RIPE-DB-MNT mnt-by: MNT-LANNET-LVIV created: 2016-08-04T10:47:29Z last-modified: 2016-11-25T14:38:37Z 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