shell:$ nslookup -timeout=2 -retry=1 'mta-x400.telepost.fr'
Server:		75.98.161.224
Address:	75.98.161.224#53

Non-authoritative answer:
mta-x400.telepost.fr	canonical name = x400.telepost.fr.
Name:	x400.telepost.fr
Address: 93.92.106.253