These entries are queried from radb.net using whois, you can try my project getting these.
:AS50485 route: 159.148.231.0/24 descr: Belam-Riga SIA origin: AS50485 mnt-by: LATNET-MNT created: 2010-02-22T15:53:40Z last-modified: 2010-02-22T15:53:40Z 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