Insufficient responses for TCP sequencing (3), OS detection may be less accurate
Interesting ports on  (208.156.105.18):
(The 1535 ports scanned but not shown below are in state: closed)
Port       State       Service
21/tcp     open        ftp                     
25/tcp     open        smtp                    
80/tcp     open        http                    
135/tcp    open        loc-srv                 
443/tcp    open        https                   
465/tcp    open        smtps                   
1031/tcp   open        iad2                    

Remote operating system guess: Windows NT4 / Win95 / Win98

# Nmap run completed at Fri Jun  1 05:41:16 2001 -- 1 IP address (1 host up) scanned in 13 seconds