www.ntsb.gov-nmap_results

Starting nmap V. 2.54BETA2 ( www.insecure.org/nmap/ )
Interesting ports on firewall.ntsb.gov (207.76.142.3):
Port       State       Service
80/tcp     open        http                    

TCP Sequence Prediction: Class=random positive increments
                         Difficulty=15242 (Worthy challenge)
Remote operating system guess: Microsoft NT 4.0 Server SP5 + 2047 Hotfixes

Nmap run completed -- 1 IP address (1 host up) scanned in 13 seconds