shell:$ nslookup -timeout=2 -retry=1 'cust-dv.zentrick.com'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
cust-dv.zentrick.com	canonical name = cf.vast.doubleverify.com.
cf.vast.doubleverify.com	canonical name = cf.vast.doubleverify.com.cdn.cloudflare.net.
Name:	cf.vast.doubleverify.com.cdn.cloudflare.net
Address: 104.18.36.54
Name:	cf.vast.doubleverify.com.cdn.cloudflare.net
Address: 172.64.151.202