These entries are queried from radb.net using whois, you can try my project getting these.
:AS21243 route: 37.247.244.0/23 descr: Polkomtel Sp. z o.o. descr: Warsaw, Poland origin: AS21243 mnt-by: POLKOMTEL-MNT created: 2019-04-26T08:41:31Z last-modified: 2019-04-26T08:41:31Z 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: 212.2.105.0/24 descr: PlusGSM transit core network descr: Warsaw, Poland origin: AS21243 notify: i.neska [at] polkomtel.com.pl mnt-by: POLKOMTEL-MNT created: 2003-08-07T11:34:22Z last-modified: 2003-08-07T11:34:22Z 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: 212.2.106.0/23 descr: PlusGSM transit core network descr: Warsaw, Poland origin: AS21243 notify: i.neska [at] polkomtel.com.pl mnt-by: POLKOMTEL-MNT created: 2003-08-07T11:34:23Z last-modified: 2003-08-07T11:34:23Z 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