I noticed lines like these in my apache log
[Fri Oct 15 21:09:43 2010] [error] [client 216.205.76.228] client sent
HTTP/1.1 request without hostname (see RFC2616 section 14.23):
/w00tw00t.at.ISC.SANS.DFind:)
Coming from the following IP addresses:
184.73.216.225
208.109.154.93
216.205.76.228
74.86.23.51
What does the error message mean and what are these people trying to do?