These entries are queried from radb.net using whois, you can try my project getting these.
:AS8763 route: 81.91.160.0/20 descr: DENIC eG origin: AS8763 notify: ripe [at] denic.de mnt-by: DE-DOM created: 2002-07-25T10:32:54Z last-modified: 2002-07-25T10:32:54Z 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: 81.91.170.0/24 descr: DENIC eG origin: AS8763 notify: ripe [at] denic.de mnt-by: DE-DOM created: 2007-05-25T15:06:11Z last-modified: 2007-05-25T15:06:11Z 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: **************************** rpki-ov-state: valid route: 81.91.172.0/24 descr: DENIC eG origin: AS8763 notify: ripe [at] denic.de mnt-by: DE-DOM created: 2007-05-25T15:06:11Z last-modified: 2007-05-25T15:06:11Z 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: **************************** rpki-ov-state: valid route: 81.91.173.0/24 origin: AS8763 mnt-by: DE-DOM created: 2017-10-10T12:19:07Z last-modified: 2017-10-10T12:19:07Z 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: 185.151.140.0/24 origin: AS8763 mnt-by: DE-DOM created: 2016-08-29T08:17:26Z last-modified: 2016-08-29T08:17:26Z 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 route6: 2a02:568::/32 descr: DENIC-IPv6 descr: DENIC eG origin: AS8763 mnt-by: DE-DOM created: 2009-06-18T11:31:59Z last-modified: 2009-06-18T11:31:59Z 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: 2a02:568:200::/40 descr: AMS region space origin: AS8763 mnt-by: DE-DOM created: 2013-06-18T06:55:41Z last-modified: 2013-06-18T06:55:41Z 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