track ip addresses, lookup mac addresses, etc

Check if you're behind a Proxy Server

By using a proxy server, your IP address will be hidden from websites and other web services that you use. Any web resource you access can gather personal information about you through your IP address. Anonymous proxy servers hide your IP address thereby saving you from vulnerabilities concerned with it.

» You are behind proxy 3.239.127.73
» Your real IP address is 44.200.30.73, 44.200.30.73

Here are the variables sent by the server

VariablesValues
REMOTE_ADDR3.239.127.73
HTTP_X_FORWARDED_FOR44.200.30.73, 44.200.30.73
HTTP_X_REAL_IP44.200.30.73

Setting up Web Proxies in Mozilla Firefox

Setting up Web Proxies in Internet Explorer