shell:$ nslookup -timeout=2 -retry=1 'vistarsagency.rtb-useast-v4.ak-is2.net'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	vistarsagency.rtb-useast-v4.ak-is2.net
Address: 198.134.116.50