Above is the IP address that made the connection with ip.42.pl server.
It may be yours or your NAT router, or your WWW proxy. Usually proxies announce themselves in HTTP headers.
Below are the HTTP headers sent by your web browser (and/or by the proxy):
Remember that you may have some Cookies left for other sites, they only show up when connecting to those sites.
If you want only plain text IP (like for scripting), use: http://ip.42.pl/anything.