shell:$ nslookup -timeout=2 -retry=1 'ns1.pavietnam.vn' Server: 75.98.161.224 Address: 75.98.161.224#53 Non-authoritative answer: Name: ns1.pavietnam.vn Address: 112.213.89.3 Name: ns1.pavietnam.vn Address: 2406:9c80::66