These entries are queried from radb.net using whois, you can try my project getting these.
:AS51855 route: 78.108.247.0/24 origin: AS51855 mnt-by: CableBulgaria mnt-by: GCN-LIR-MNT mnt-by: GlobalComNet created: 2020-01-13T14:36:04Z last-modified: 2020-08-11T20:09:06Z 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 route: 87.246.45.0/24 descr: NETCOMP-NET-BG origin: AS51855 mnt-by: GCN-LIR-MNT created: 2013-12-16T14:48:36Z last-modified: 2013-12-16T14:48:36Z 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 route: 212.50.21.0/24 descr: Spectrum NET PA space origin: AS51855 notify: registry-ripe [at] spnet.net mnt-by: SPNET-MNT created: 2010-11-22T12:23:54Z last-modified: 2010-11-22T12:23:54Z 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