That's a subdomain. They haven't even registered an IP with it, as you can tell by it not even responding. Also, dnsstuff.com says this:-
Answer:
No A records exist for thesims3.ea.com. [Neg TTL=3600 seconds]
Details:
swdns.ea.com. (an authoritative nameserver for ea.com.) says that there are no A records for thesims3.ea.com