These entries are queried from radb.net using whois, you can try my project getting these.
:AS57029 route: 91.230.51.0/24 descr: Case Electronics B.V. origin: AS57029 org: ORG-CE12-RIPE mnt-lower: OPENPEERING-MNT mnt-routes: OPENPEERING-MNT mnt-by: OPENPEERING-MNT created: 2011-07-07T14:19:09Z last-modified: 2011-07-07T14:19:09Z 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: 185.150.56.0/22 origin: AS57029 org: ORG-CTB5-RIPE descr: Case Telecom B.V. mnt-by: nl-bitbunker-1-mnt created: 2016-05-10T13:18:11Z last-modified: 2016-09-15T20:20:49Z 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 route6: 2a07:72c0::/29 origin: AS57029 mnt-by: nl-bitbunker-1-mnt created: 2016-05-10T13:21:34Z last-modified: 2016-05-10T13:21:34Z 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