There is no page on this server with the address/name mirror.zoidberg.org. If you regularly access the same URL and got this message for the first time, it might be a temporary issue; please come back later. Otherwise contact the person running the site you're missing. I can't tell you who that is, though.
If you have been encountering network-abusive behaviour coming from this IP address, please contact me so I can determine who's responsible and take swift action. Please don't contact me if you're looking for a website that has disappeared. I can't help you (unless I have been maintaining the website in question personally, and that's not the case for most websites on this server).