These entries are queried from radb.net using whois, you can try my project getting these.
:AS-NITREX as-set: AS-NITREX descr: Nitrex AS Group members: AS39846 members: AS28697 members: AS43057 members: AS25585 members: AS41593 members: AS-SYNERGYWORKS members: AS-UNITVECTOR tech-c: DUMY-RIPE admin-c: DUMY-RIPE notify: ripe [at] nitrex.net mnt-by: NITREX-MNT created: 2004-03-03T17:22:16Z last-modified: 2016-06-02T17:35:01Z 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: ****************************