shell:$ nslookup -timeout=2 -retry=1 'sixproxy.herokuapp.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
sixproxy.herokuapp.com	canonical name = ie02.ingress.herokuapp.com.
Name:	ie02.ingress.herokuapp.com
Address: 46.137.15.86
Name:	ie02.ingress.herokuapp.com
Address: 54.73.53.134
Name:	ie02.ingress.herokuapp.com
Address: 54.220.192.176