shell:$ nslookup -timeout=2 -retry=1 'vistarsagency.rtb-useast-v4.ak-is2.net'
Server:		127.0.0.53
Address:	127.0.0.53#53

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