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

Non-authoritative answer:
Name:	proxyprincipal.appspot.com
Address: 172.217.4.84
Name:	proxyprincipal.appspot.com
Address: 2607:f8b0:4009:805::2014