What does this mean on "Who's Online"

I found this today when I clicked on the "Who's Online" option:

200.71.40.87

                                                            
                               **Session ID:**

Host:
User Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
http://www.gaitherreporter.com/ dbf0e90d3b6c29bb88db83d6761f0b20 Static-IP-cr200714087.cable.net.co

Well, it copied poorly and the bloke is gone. But, where it says "www.gaitherreporter.com" is the last line, the line beneath USER AGENT and I think is supposed to show a page Id address on my site.

That "dbf0e..." is the Host Info (no clue how it got where it is since I copied and pasted :ohmy:).

I clicked on "gatherreporter.com" and no such address.

Any ideas about this? Is it a security problem, something I need to do something about?

Thank you!