> **Possible Duplicate:**  
> [How does IPv4 Subnetting Work?](https://serverfault.com/questions/49765/how-does-ipv4-subnetting-work)  

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I have a list of IP ranges I would like to ban, an example being:


Where `xx` is anything.

I've added the domain and IP restrictions into IIS.  When I click add deny entry, I see:

![enter image description here][1]

For my above example, what should I enter as the values?

  [1]: http://i.stack.imgur.com/GjHEl.jpg