shell:$ nslookup -timeout=2 -retry=1 'cm.g.doubleclick.net'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
Name:	cm.g.doubleclick.net
Address: 172.253.132.155
Name:	cm.g.doubleclick.net
Address: 172.253.132.156
Name:	cm.g.doubleclick.net
Address: 172.253.132.154
Name:	cm.g.doubleclick.net
Address: 172.253.132.157