shell:$ nslookup -timeout=2 -retry=1 'mail-tester.com'
Server:		127.0.0.53
Address:	127.0.0.53#53

Non-authoritative answer:
Name:	mail-tester.com
Address: 104.26.0.117
Name:	mail-tester.com
Address: 172.67.69.216
Name:	mail-tester.com
Address: 104.26.1.117
Name:	mail-tester.com
Address: 2606:4700:20::681a:175
Name:	mail-tester.com
Address: 2606:4700:20::681a:75
Name:	mail-tester.com
Address: 2606:4700:20::ac43:45d8