shell:$ nslookup -timeout=2 -retry=1 'ec2-54-156-187-91.compute-1.amazonaws.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	ec2-54-156-187-91.compute-1.amazonaws.com
Address: 54.156.187.91