These entries are queried from radb.net using whois, you can try my project getting these.
:AS31527 route: 213.91.252.0/24 descr: Telepol Security origin: AS31527 notify: registry-ip [at] vivacom.bg mnt-lower: BT95-ADM mnt-lower: V6Net-MNT mnt-routes: BT95-ADM mnt-by: BT95-ADM created: 2004-06-07T14:47:14Z last-modified: 2018-08-10T09:02:44Z 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