Blocking an IP address from accessing a Web server

I have a dedicated server colocated across town, running IIS 5, SP 2.  I recently have noticed something very unusual in my IIS web logs, and I want to know if it is possible to block an IP address, or a range of IP addresses from accessing files on my server?  If so, how?
KapustaAsked:
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HousenetConnect With a Mentor Commented:
Hi
-In IIS click the properties of say default website (example)& go to the directory security tab.
-Click on the IP address & domain name restrictions.
-To add single ip to be denied choose "group of computers" and add say 200.10.10.10 255.255.255.255. Using 255.255.255.0 would include and computer from 200.10.10.x.
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HousenetCommented:
I meant to say "would include ANY computer from 200.10.10.x."
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KapustaAuthor Commented:
What if you wanted to block every IP from 202.96.0.0 to 202.96.255.255 ?  What subnet mask would I use?   What if I wanted to block 202.0.0.0 to 202.255.255.255 ?
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KapustaAuthor Commented:
>> To add single ip to be denied choose "group of computers" and add say 200.10.10.10 255.255.255.255 <<

Why would I choose "group of computers" if I only want to deny ONE IP?
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HousenetCommented:
What if I wanted to block 202.0.0.0 to 202.255.255.255 ?
-That would be 202.0.0.0 mask 255.0.0.0
"Why would I choose "group of computers" if I only want to deny ONE IP? " You're right, choose single computer.. I forgot about that choice...
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KapustaAuthor Commented:
Any idea if one can bypass the Windows dialog and create an ASCII file containing the IPs that I wish to block? IOW, if I have 200 IPs that I want to block, it sure would be nice if there was a faster way to create the blacklist than to type each IP one by one into the dialog window.
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