These entries are queried from radb.net using whois, you can try my project getting these.
:AS63751 route: 103.221.212.0/22 descr: Customer of Viettel VCBS-AS-VN origin: AS63751 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20170731 source: NTTCOM rpki-ov-state: valid route: 103.221.212.0/22 descr: Vietcombank securities Company limited origin: AS63751 mnt-by: MAINT-AS18403 changed: netadmin [at] fpt.vn 20160708 #01:49:20Z source: RADB last-modified: 2023-11-13T15:49:34Z rpki-ov-state: valid route: 103.221.212.0/22 descr: VCBS-VN origin: AS63751 mnt-by: MAINT-VN-VNNIC last-modified: 2022-03-25T11:08:28Z source: APNIC rpki-ov-state: valid route: 103.221.212.0/23 descr: Customer of Viettel VCBS-AS-VN origin: AS63751 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20170731 source: NTTCOM rpki-ov-state: valid route: 103.221.212.0/23 descr: VCBS-VN origin: AS63751 mnt-by: MAINT-VN-VNNIC last-modified: 2022-03-25T11:08:30Z source: APNIC rpki-ov-state: valid route: 103.221.212.0/24 descr: VCBS-VN origin: AS63751 mnt-by: MAINT-VN-VNNIC last-modified: 2022-03-25T11:08:32Z source: APNIC rpki-ov-state: valid route: 103.221.212.0/24 descr: Vietcombank securities Company limited origin: AS63751 mnt-by: MAINT-AS18403 changed: netadmin [at] fpt.vn 20160709 #09:44:51Z source: RADB last-modified: 2023-11-13T15:49:34Z rpki-ov-state: valid route: 103.221.212.0/24 descr: Customer of Viettel VCBS-AS-VN origin: AS63751 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20170731 source: NTTCOM rpki-ov-state: valid route: 103.221.213.0/24 descr: Customer of Viettel VCBS-AS-VN origin: AS63751 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20170731 source: NTTCOM rpki-ov-state: valid route: 103.221.213.0/24 descr: Vietcombank securities Company limited origin: AS63751 mnt-by: MAINT-AS18403 changed: netadmin [at] fpt.vn 20160709 #09:45:19Z source: RADB last-modified: 2023-11-13T15:49:34Z rpki-ov-state: valid route: 103.221.213.0/24 descr: VCBS-VN origin: AS63751 mnt-by: MAINT-VN-VNNIC last-modified: 2022-03-25T11:08:34Z source: APNIC rpki-ov-state: valid route: 103.221.214.0/23 descr: Customer of Viettel VCBS-AS-VN origin: AS63751 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20170731 source: NTTCOM rpki-ov-state: valid route: 103.221.214.0/23 descr: VCBS-VN origin: AS63751 mnt-by: MAINT-VN-VNNIC last-modified: 2022-03-25T11:08:36Z source: APNIC rpki-ov-state: valid route: 103.221.214.0/24 descr: VCBS-VN origin: AS63751 mnt-by: MAINT-VN-VNNIC last-modified: 2022-03-25T11:08:38Z source: APNIC rpki-ov-state: valid route: 103.221.214.0/24 descr: Vietcombank securities Company limited origin: AS63751 mnt-by: MAINT-AS18403 changed: netadmin [at] fpt.vn 20160709 #09:46:06Z source: RADB last-modified: 2023-11-13T15:49:34Z rpki-ov-state: valid route: 103.221.214.0/24 descr: Customer of Viettel VCBS-AS-VN origin: AS63751 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20170731 source: NTTCOM rpki-ov-state: valid route: 103.221.215.0/24 descr: Vietcombank securities Company limited origin: AS63751 mnt-by: MAINT-AS18403 changed: netadmin [at] fpt.vn 20160709 #09:46:42Z source: RADB last-modified: 2023-11-13T15:49:34Z rpki-ov-state: valid route: 103.221.215.0/24 descr: VCBS-VN origin: AS63751 mnt-by: MAINT-VN-VNNIC last-modified: 2022-03-25T11:08:40Z source: APNIC rpki-ov-state: valid route: 103.221.215.0/24 descr: Customer of Viettel VCBS-AS-VN origin: AS63751 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20170731 source: NTTCOM rpki-ov-state: valid