shell:$ nslookup -timeout=2 -retry=1 'ns6.markmonitor.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	ns6.markmonitor.com
Address: 176.97.158.3
Name:	ns6.markmonitor.com
Address: 2001:67c:10b8::3