shell:$ nslookup -timeout=2 -retry=1 'mailtrap.io'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	mailtrap.io
Address: 104.20.37.156
Name:	mailtrap.io
Address: 172.66.146.152
Name:	mailtrap.io
Address: 2606:4700:10::6814:259c
Name:	mailtrap.io
Address: 2606:4700:10::ac42:9298