I have NS5GT firewall and I want to define an address range (eg: 195.215.8.0 - 195.215.8.255) in the address list to block skype servers. But I haven't found how to do this. Address list section allows to add only one domain or ip address at once. How can I define this range? Do I have to add all address individually? This is almost impossible. There must be another way to make this.