These entries are queried from radb.net using whois, you can try my project getting these.
:AS24950 route: 83.142.16.0/21 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-08-24T12:56:48Z last-modified: 2004-08-24T12:56:48Z 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: 83.142.16.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:45:26Z last-modified: 2004-07-20T09:45:26Z 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: 83.142.17.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:51:17Z last-modified: 2004-07-20T09:51:17Z 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: 83.142.18.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:52:13Z last-modified: 2004-07-20T09:52:13Z 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: 83.142.19.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:52:39Z last-modified: 2004-07-20T09:52:39Z 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: not_found # No ROAs found, or RPKI validation not enabled for source route: 83.142.20.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:52:45Z last-modified: 2004-07-20T09:52:45Z 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: 83.142.21.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:52:51Z last-modified: 2004-07-20T09:52:51Z 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: 83.142.22.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:53:09Z last-modified: 2004-07-20T09:53:09Z 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: not_found # No ROAs found, or RPKI validation not enabled for source route: 83.142.23.0/24 descr: Sofiasat PI origin: AS24950 mnt-by: SOFIASAT-MNT notify: noc [at] sofiasat.com created: 2004-07-20T09:53:14Z last-modified: 2004-07-20T09:53:14Z 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