shell:$ nslookup -timeout=2 -retry=1 'mail.dtac.com'
Server:		1.1.1.1
Address:	1.1.1.1#53

Non-authoritative answer:
mail.dtac.com	canonical name = cp.intermedia.net.
cp.intermedia.net	canonical name = cp.intermedia.net.cdn.cloudflare.net.
cp.intermedia.net.cdn.cloudflare.net	canonical name = exchange.gslb.intermedia.net.
Name:	exchange.gslb.intermedia.net
Address: 199.193.204.231