These entries are queried from radb.net using whois, you can try my project getting these.
:AS51962 route: 31.148.221.0/24 origin: AS51962 mnt-by: RIPE-DB-MNT mnt-by: MNT-POWERNETUA created: 2016-06-29T08:44:41Z last-modified: 2016-11-25T14:38:37Z 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