is there a way to configure a whitelist in IIS?

I am working in 2003 Server running IIS to host several .mil sites, all of them are also available to the public.  I have a new site I have to build that can onli be accessable for users who are on a .mil machine.  Does anyone know how I can set up a "whitelist" in IIS to allow these .mil addresses only.
clonganeckerAsked:
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flipzCommented:
I think this can be accomplished but it will affect the performance of the server due to a reverse IP lookup requirement. To what extend I don't. If you click the 'Directory Security' tab in the properties of the website. Edit the IP address and domain name restrictions list. By default all computers will be denied access - then add an entry to the list - select the 'Domain name' option and enter *.mil. After entering these settings - run some tests to see if it works. If not - let me know.
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Microsoft IIS Web Server

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