Why does some sites like WhatisMyIp.com show my real IP?

Why does some sites like whatismyip.c0m show my real IP even when I am behind a proxy? Does this mean sites could still get my real IP even if I am behind a proxy? Just wondering thanks....

Does this mean sites could still get my real IP even if I am behind a proxy?

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That's what it means. The proxy will attach additional header parameters to your request, one of them is 'Via' and another one is 'X-Forwarded-For'. It will look like this:

Via: http_protocol_number name.of.the.proxyroxyport
X-Forwarded-For: 123.456.789.123 <- Your IP address

Both these header lines can be evaluated by the server you're sending the request to, just like any other http header line. It's up to the proxy what it wants to add, so it's a good idea to test them before you use them.

Here's a site that gives a bit more information about what is sent than just your ip address:

It usually means your proxy isn't good. It should show the proxy if everything's working right.

I always use a service like this to test and see if a proxy is anonymous if I'm not sure if it is or not.

Online proxy checkers are garbage. Use a local one.

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