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

Non-authoritative answer:
Name:	castr.io
Address: 104.18.29.66
Name:	castr.io
Address: 104.18.28.66
Name:	castr.io
Address: 2606:4700::6812:1c42
Name:	castr.io
Address: 2606:4700::6812:1d42