These entries are queried from radb.net using whois, you can try my project getting these.
:AS1200 route: 91.200.16.0/22 descr: AMS-IX3 origin: AS1200 notify: noc [at] ams-ix.net mnt-by: AMS-IX-MNT mnt-routes: AMS-IX-MNT created: 2007-10-05T14:10:32Z last-modified: 2011-04-27T15:04:21Z 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: 185.55.136.0/22 descr: AMS-IX6 origin: AS1200 mnt-by: AMS-IX-MNT mnt-routes: AMS-IX-MNT created: 2014-04-25T09:22:23Z last-modified: 2014-04-25T09:22:23Z 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: 195.69.144.0/22 descr: AMS-IX3 origin: AS1200 notify: noc [at] ams-ix.net mnt-by: AMS-IX-MNT created: 2003-03-12T10:01:58Z last-modified: 2003-03-12T10:01:58Z 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: 2001:67c:1a8::/48 descr: AMS-IX4 origin: AS1200 notify: noc [at] ams-ix.net mnt-by: AMS-IX-MNT created: 2010-03-15T13:42:20Z last-modified: 2011-04-27T15:04:21Z 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: 2001:7f8:1::/48 descr: AMS-IX IPv6 Peering LANs origin: AS1200 notify: noc [at] ams-ix.net mnt-by: AMS-IX-MNT created: 2010-03-11T10:28:12Z last-modified: 2011-04-27T15:04:21Z 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