These entries are queried from radb.net using whois, you can try my project getting these.
:AS57538 route: 91.232.209.0/24 descr: PRB route object origin: AS57538 mnt-by: PRB1-MNT created: 2011-11-30T15:07:55Z last-modified: 2011-11-30T15:07:55Z 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