shell:$ nslookup -timeout=2 -retry=1 'o2.cz'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	o2.cz
Address: 160.218.161.162
Name:	o2.cz
Address: 2001:41d8:1:742:2::2