Though i'm not completely sure how or why this works
... I tested it, and its works allright!
!!
Linux:
sudo iptables -A INPUT -s 173.194.55.0/24 -j REJECT
sudo iptables -A INPUT -s 206.111.0.0/16 -j REJECT
Windows:
netsh advfirewall firewall add rule name="tweakme" dir=in action=block remoteip=173.194.55.0/24,206.111.0.0/16 enable=yes