These entries are queried from radb.net using whois, you can try my project getting these.
:AS16004 route: 217.29.64.0/21 descr: MIX-PEERING descr: Milan (Italy) interconnection point origin: AS16004 mnt-by: ASMIX-MNT created: 2008-07-11T16:23:04Z last-modified: 2008-07-11T16:23:04Z 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: not_found # No ROAs found, or RPKI validation not enabled for source route: 217.29.72.0/21 descr: MIX-SERVICES descr: Milan (Italy) interconnection point origin: AS16004 mnt-by: ASMIX-MNT created: 2005-11-17T10:29:24Z last-modified: 2005-11-17T10:29:24Z 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: 217.29.72.0/24 descr: MIX-SERVICES-72 origin: AS16004 mnt-by: ASMIX-MNT created: 2020-03-20T15:18:42Z last-modified: 2020-03-25T09:18:10Z 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: 217.29.76.0/24 descr: MIX-EXT-SERVICES-76 origin: AS16004 mnt-by: ASMIX-MNT created: 2020-03-20T15:18:14Z last-modified: 2020-03-20T15:18:14Z 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: 217.29.77.0/24 descr: MIX-SERVICES-77 origin: AS16004 mnt-by: ASMIX-MNT created: 2020-03-20T15:16:41Z last-modified: 2020-03-20T15:17:07Z 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 route6: 2001:1ac0::/32 descr: MIX-1 descr: Milan (Italy) interconnection point origin: AS16004 notify: noc [at] mix-it.net mnt-by: ASMIX-MNT created: 2005-05-23T15:39:01Z last-modified: 2005-05-23T15:39:01Z 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: 2001:1ac0::/64 descr: MIX-SERVICES-77-v6 origin: AS16004 mnt-by: ASMIX-MNT created: 2020-04-06T11:49:51Z last-modified: 2020-04-06T11:49:51Z 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