shell:$ nslookup -timeout=2 -retry=1 'sf-in-f138.1e100.net'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	sf-in-f138.1e100.net
Address: 74.125.24.138
Name:	sf-in-f138.1e100.net
Address: 2404:6800:4003:c03::8a