These entries are queried from radb.net using whois, you can try my project getting these.
:AS57223 route: 81.163.72.0/21 descr: SIA NOVA origin: AS57223 mnt-by: VN6424-MNT notify: it [at] 404.lv created: 2012-01-30T15:34:10Z last-modified: 2012-05-06T17:22:30Z 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: 193.0.136.0/22 descr: SIA NOVA origin: AS57223 mnt-by: VN6424-MNT notify: it [at] 404.lv created: 2012-05-06T17:23:24Z last-modified: 2012-05-06T17:23:24Z 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: not_found # No ROAs found, or RPKI validation not enabled for source route: 193.0.140.0/23 descr: SIA NOVA origin: AS57223 mnt-by: VN6424-MNT notify: it [at] 404.lv created: 2012-05-06T17:24:20Z last-modified: 2012-05-06T17:24:20Z 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: 195.211.156.0/22 descr: NOVA SIA origin: AS57223 mnt-by: VN6424-MNT notify: it [at] 404.lv created: 2012-01-30T13:08:36Z last-modified: 2012-05-06T17:26:07Z 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: not_found # No ROAs found, or RPKI validation not enabled for source