shell:$ nslookup -timeout=2 -retry=1 'opensource.fb.com' Server: 75.98.161.224 Address: 75.98.161.224#53 Non-authoritative answer: Name: opensource.fb.com Address: 108.138.159.4 Name: opensource.fb.com Address: 2600:9000:2357:bc00:1f:2d3:8440:93a1