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Detecting if IP is a proxy

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oleshka:
I know how to whois an IP and various other tools to look into IP's but how do you tell if an IP is that of a proxy?

Is there anyway at all to find out?

Charter:
There are a number of possibilities not only to detect a visitor using several anonymous proxy servers, but also to detect his real IP even if he is using an anonymous proxy server.

You cannot detect IP with the help of cookies. However, when you first visit a web site, the IP (i.e. your proxy server s IP) is detected by the web server and then stored in the cookies.

ActiveX and plug-ins are various add-ons and modules of your browser. These modules are in fact real proper programs run on the client s machine and therefore they have wider capacities than Java and Javascript. They can easily detect your browser settings and track down your real IP address.

balachis:
How do yo detect an IP of a spammer?
Can you do that?
Let's say that I'm a regular user that don't have any website and I got a so many spam messages from someone I don't even know in my inbox, how can I detect where's he ?
 

hostaddonltd:
One of my friends uses this php-script which doesnt allow users with proxy to get on the site - if thats what you need mate pm me and ill get you the name or the link

saravanan28:
In the Windows search bar, type "Internet Options".
Select Internet Options from the results list.
Click to open the Connections tab.
Click the LAN settings button.
Notice in the Proxy Server section:

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