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

Non-authoritative answer:
cm.adgrx.com	canonical name = rtb.adgrx.com.
rtb.adgrx.com	canonical name = rtb.adgrx.com.tech.akadns.net.
Name:	rtb.adgrx.com.tech.akadns.net
Address: 44.221.2.112