any open proxy checker?

["SB CH" <chulmin2 () hotmail com>]

Hello, all.

I have operated some network and I found that some server operated with 
open proxy.
As a matter of fact, I can see lots of scans toward port is 1080, 3128, 
8080.
So I would like to manage my network just using scheduled scanning toward 
proxy is opened or not.
So do you know any rocommended program in order to know proxy is open or 
not toward some IP ranges? Surely, I am a secure maintainer not anonymous 
proxy finder.

Thanks for your answer.

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