Use This To Track IPs

Some fellas try to be funny with you, sending spam mails and doing stuff through the Net? You can get back by going to this site: http://www.ip-adress.com/ip_tracer/ to track that person down.

The site has several useful links for checking remote IPs, tracing emails (good to nab spammers) as well as the occasional speedtest. Of course, as you hit the site, your IP is also tracked. Keep the link in your bookmarks - it could prove useful one day.