In the strict mode, the remote host name of Level 1 proxies must equal to the remote IP adress. It will make the number of Level 1 proxies much less. It is recommended to use the normal mode.
The online proxy tester: http://info.my-proxy.com also uses the strict mode:
REMOTE_ADDR 212.151.198.78
REMOTE_HOST c212-151-198-78.swipnet.se Dubious
REMOTE_PORT 56775
Conclusion You are possibly using a proxy.
ProxyJudge gives you the level of your proxy, also using the strict mode:
But not all the web server will use REMOTE_HOST to detect whether the client is using a proxy because it will make the server overload. You can find that the slight PHP proxyjudge always return nothing for REMOTE_HOST.
You can find PHP proxyjudge example here: http://fpl.my-proxy.com/proxyjudge.php
I know many proxy test tools just use the level on the ProxyJudge page to classify the proxies, which is more faster. I don't think it's a good method. FPL judges the proxies by itself using the information from ProxyJudge according to its own principle:
High Anonymous Proxy (Level 1): The web server can't detect whether you are using a proxy by the information your browser sent.
Anonymous Proxy (Level 2): The web server knows that you are probably using a proxy, but it can't detect your real IP.
Transparent Proxy (Level 3): The web server knows that you are using a proxy and it can also detect your real IP address.