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IIS7 ban IP range

Possible Duplicate:
How does IPv4 Subnetting Work?

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

119.30.47.xx

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

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