I noticed lines like these in my apache log
[Fri Oct 15 21:09:43 2010] [error] [client 188.8.131.52] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
Coming from the following IP addresses:
184.108.40.206 220.127.116.11 18.104.22.168 22.214.171.124
What does the error message mean and what are these people trying to do?