This value should return the ip address from the user that is viewing the page, if you are testing this on a local development environment it will probably give you 127.0.0.1, this is your local loopback address that points to your own machine. If you viewed this page from another machine on your local network it would tell you the network ip address of that machine. If viewed the page from a internet connected server it would show your ISP assigned ip address that is used on the internet, this is the one that you are seeing with the link you provided.
Here is a link to the php page that details these server variables.
reserved.variables.server.php