These entries are queried from radb.net using whois, you can try my project getting these.
:AS57537 route: 185.152.232.0/22 origin: AS57537 mnt-by: NET-D-SIGN-MNT created: 2016-05-20T12:56:15Z last-modified: 2016-05-20T12:56:15Z 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: 213.148.96.0/19 descr: Net-D-Sign GmbH origin: AS57537 mnt-by: NET-D-SIGN-MNT created: 2012-04-12T14:50:20Z last-modified: 2012-04-12T14:50:20Z 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 route6: 2a03:2cc0::/32 descr: Net-D-Sign GmbH origin: AS57537 mnt-by: NET-D-SIGN-MNT created: 2012-10-24T11:22:43Z last-modified: 2012-10-24T11:22:43Z 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