These entries are queried from radb.net using whois, you can try my project getting these.
:AS8522 route: 139.91.0.0/16 descr: FORTH origin: AS8522 mnt-by: FORTH-NOC-MNT notify: noc [at] ics.forth.gr created: 1970-01-01T00:00:00Z last-modified: 2005-10-20T07:40:53Z 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: 139.91.250.0/24 descr: FORTH Athens origin: AS8522 mnt-by: FORTH-NOC-MNT created: 2005-10-20T07:43:50Z last-modified: 2005-10-20T07:43:50Z source: RIPE notify: noc [at] ics.forth.gr 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: 139.91.252.0/24 descr: FORTH Athens origin: AS8522 mnt-by: FORTH-NOC-MNT created: 2012-05-17T13:04:40Z last-modified: 2012-05-17T13:04:40Z 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 route: 192.67.249.0/24 origin: AS8522 mnt-by: FORTH-NOC-MNT created: 2020-03-03T14:05:48Z last-modified: 2020-03-03T14:06:54Z source: RIPE org: ORG-FoRa4-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: 2001:648:2c30::/48 descr: FORTHv6 descr: Foundation for Research and Technology Hellas descr: Institute of Computer Sciense origin: AS8522 mnt-by: FORTH-NOC-MNT notify: noc [at] ics.forth.gr created: 2007-03-23T13:35:19Z last-modified: 2007-03-23T13:38:05Z 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