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UDGER.com Public CGI Proxy list
UDGER.com is a service specialized in User Agent Analysis and detection. They also provide blacklists thanks to the different services deployed worlwide to mine the different types of existing user agents. This blacklist is an up-to-date collection of open public CGI Proxies worldwide. A CGI (Common Gateway Interface) proxy appears to a user as a web page that allows the user to access a different site through it, in most cases anonymously.
IP addresses in this list are used to connect anonymously using these Public CGI Proxy. If you want ban access from anonymous proxies to your services, then this list should be part of your collection.