shell:$ nslookup -timeout=2 -retry=1 'www.fly.io'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
www.fly.io	canonical name = fly.io.
Name:	fly.io
Address: 37.16.18.81
Name:	fly.io
Address: 2a09:8280:1::a:791