These entries are queried from radb.net using whois, you can try my project getting these.
:AS51387 route: 91.208.231.0/24 descr: POTOK origin: AS51387 mnt-by: MNT-POTOTSKA created: 2010-08-11T10:27:53Z last-modified: 2013-12-11T13:09:27Z 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