shell:$ nslookup -timeout=2 -retry=1 'a.gtld-servers.net'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	a.gtld-servers.net
Address: 192.5.6.30
Name:	a.gtld-servers.net
Address: 2001:503:a83e::2:30