These entries are queried from radb.net using whois, you can try my project getting these.
:AS15721 route: 217.21.160.0/21 descr: CTCO-NET origin: AS15721 mnt-by: CTCO-MNT created: 2009-03-10T13:52:12Z last-modified: 2009-03-10T13:52:12Z 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: 217.21.160.0/22 origin: AS15721 mnt-by: CTCO-MNT created: 2017-04-07T09:42:54Z last-modified: 2017-04-07T09:42:54Z 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: 217.21.164.0/22 origin: AS15721 mnt-by: CTCO-MNT created: 2017-04-07T09:43:50Z last-modified: 2017-04-07T09:43:50Z 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 route: 217.21.168.0/21 descr: CTCO-NET origin: AS15721 mnt-by: CTCO-MNT created: 2009-03-10T13:54:08Z last-modified: 2009-03-10T13:54:08Z 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: 217.21.168.0/22 origin: AS15721 mnt-by: CTCO-MNT created: 2016-10-10T06:52:29Z last-modified: 2016-10-10T06:54:41Z source: RIPE descr: CTCO-NET 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: 217.21.172.0/22 origin: AS15721 mnt-by: CTCO-MNT created: 2016-10-10T06:53:44Z last-modified: 2016-10-10T06:54:15Z source: RIPE descr: CTCO-NET 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: 217.21.174.0/24 origin: AS15721 mnt-by: CTCO-MNT created: 2020-10-03T18:43:19Z last-modified: 2020-10-03T18:43:19Z source: RIPE descr: CTCO-NET 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