These entries are queried from radb.net using whois, you can try my project getting these.
:AS131440 route: 103.245.252.0/22 descr: Customer of Viettel NGUYENBAO origin: AS131440 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20180426 source: NTTCOM rpki-ov-state: valid route: 103.245.252.0/22 descr: VINAGAME-AS-VN origin: AS131440 mnt-by: MAINT-VN-VNNIC last-modified: 2021-06-15T10:41:22Z source: APNIC rpki-ov-state: valid route: 103.245.252.0/23 descr: Customer of Viettel NGUYENBAO origin: AS131440 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20180426 source: NTTCOM rpki-ov-state: valid route: 103.245.252.0/23 descr: NGUYENBAO-VN origin: AS131440 mnt-by: MAINT-VN-VNNIC last-modified: 2022-01-27T10:08:58Z source: APNIC rpki-ov-state: valid route: 103.245.252.0/24 descr: NGUYENBAO-VN origin: AS131440 mnt-by: MAINT-VN-VNNIC last-modified: 2022-01-27T10:09:01Z source: APNIC rpki-ov-state: valid route: 103.245.252.0/24 descr: Customer of Viettel NGUYENBAO origin: AS131440 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20180426 source: NTTCOM rpki-ov-state: valid route: 103.245.253.0/24 descr: NGUYENBAO-VN origin: AS131440 mnt-by: MAINT-VN-VNNIC last-modified: 2022-01-27T10:09:04Z source: APNIC rpki-ov-state: valid route: 103.245.253.0/24 descr: Customer of Viettel NGUYENBAO origin: AS131440 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20180426 source: NTTCOM rpki-ov-state: valid route: 103.245.254.0/23 descr: NGUYENBAO-VN origin: AS131440 mnt-by: MAINT-VN-VNNIC last-modified: 2022-01-27T10:09:07Z source: APNIC rpki-ov-state: valid route: 103.245.254.0/23 descr: Customer of Viettel NGUYENBAO origin: AS131440 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20180426 source: NTTCOM rpki-ov-state: valid route: 103.245.254.0/24 descr: NGUYENBAO-VN origin: AS131440 mnt-by: MAINT-VN-VNNIC last-modified: 2022-01-27T10:09:10Z source: APNIC rpki-ov-state: valid route: 103.245.254.0/24 descr: Customer of Viettel NGUYENBAO origin: AS131440 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20180426 source: NTTCOM rpki-ov-state: valid route: 103.245.255.0/24 descr: NGUYENBAO-VN origin: AS131440 mnt-by: MAINT-VN-VNNIC last-modified: 2022-01-27T10:09:13Z source: APNIC rpki-ov-state: valid route: 103.245.255.0/24 descr: Customer of Viettel NGUYENBAO origin: AS131440 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20180426 source: NTTCOM rpki-ov-state: valid