shell:$ nslookup -timeout=2 -retry=1 'proxy-appproxy-seas-sin01p-4.msappproxy.net'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
Name:	proxy-appproxy-seas-sin01p-4.msappproxy.net
Address: 4.145.78.2