IIS – need tool to find all IIS in my nw

Hi,
After being attacked by the Nimda@MM worm, I am looking for a tool / utility that can help me find all IIS servers running on my (rather large) network. All that the tool should be able to do is to tell me that server “xyz” or IP “xxx.xxx.xxx.xxx” is running IIS. (what would be great, is if it could tell me about personal web servers as well).

Any suggestions to f_somers@hotmail.com

Regards,

Floris