These entries are queried from radb.net using whois, you can try my project getting these.
:AS57728 route: 81.25.16.0/21 descr: Network of Cerberos origin: AS57728 mnt-by: MNT-HELIOSMB created: 2020-04-09T07:53:05Z last-modified: 2020-04-09T07:53:05Z 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: 81.25.24.0/21 descr: Network of Cerberos origin: AS57728 mnt-by: MNT-HELIOSMB created: 2020-04-09T07:53:28Z last-modified: 2020-04-09T07:53:28Z 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: 109.234.40.0/21 descr: Network of Cerberos origin: AS57728 mnt-by: MNT-HELIOSMB created: 2020-04-09T07:52:36Z last-modified: 2020-04-09T07:52:36Z 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: valid route: 185.255.116.0/22 origin: AS57728 mnt-by: MNT-CERBEROS created: 2020-02-27T12:59:54Z last-modified: 2020-02-27T12:59:54Z 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 route: 188.122.192.0/19 descr: Network of Magnalink origin: AS57728 mnt-by: MNT-CERBEROS created: 2020-05-26T04:28:46Z last-modified: 2020-05-26T04:29:09Z 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 route6: 2a00:1800::/32 descr: Network of Cerberos origin: AS57728 mnt-by: MNT-HELIOSMB created: 2020-04-09T07:53:49Z last-modified: 2020-04-09T07:53:49Z 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 route6: 2a00:1807::/32 origin: AS57728 mnt-by: MNT-CERBEROS created: 2020-03-02T11:35:50Z last-modified: 2020-03-02T11:35:50Z 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 route6: 2a0a:b6c0::/32 descr: Network of Magnalink origin: AS57728 mnt-by: MNT-CERBEROS created: 2020-05-26T04:32:39Z last-modified: 2020-05-26T04:32:39Z 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