www.defcon.org-nmap_results

Starting nmap V. 2.54BETA1 by fyodor@insecure.org ( www.insecure.org/nmap/ )
Interesting ports on www.defcon.org (207.240.40.17):
Port       State       Service
80/tcp     open        http                    

TCP Sequence Prediction: Class=random positive increments
                         Difficulty=74431 (Worthy challenge)
Remote operating system guess: BSDI BSD/OS 3.0-3.1 (or possibly MacOS, NetBSD)

Nmap run completed -- 1 IP address (1 host up) scanned in 5 seconds