Why is my router saying i'm being DOS Attacked by Counterstrike.com?

-I was checking my router logs(because someone was DOSing me a while ago) to see if i had been DOSed attacked again. At the top of the list was "[DoS Attack: ACK Scan] from source: 65.99.247.7, port 80" I typed the IP address into Google Chrome and it can up with Counterstrike.com? I do play counterstrike