These entries are queried from radb.net using whois, you can try my project getting these.
:AS15818 route: 159.148.90.0/24 descr: LATVIJAS GAZE origin: AS15818 org: ORG-LTGA1-RIPE mnt-by: AS2588-MNT created: 2008-03-19T20:46:58Z last-modified: 2008-03-19T20:46:58Z 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