Insufficient responses for TCP sequencing (0), OS detection may be less accurate
Interesting ports on host-20.liquidaudio.com (209.19.53.20):
(The 1524 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                    
106/tcp    open        pop3pw                  
110/tcp    open        pop-3                   
135/tcp    open        loc-srv                 
137/tcp    filtered    netbios-ns              
138/tcp    filtered    netbios-dgm             
139/tcp    filtered    netbios-ssn             
143/tcp    open        imap2                   
389/tcp    open        ldap                    
443/tcp    open        https                   
636/tcp    open        ldapssl                 
674/tcp    open        unknown                 
993/tcp    open        imaps                   
1031/tcp   open        iad2                    
1433/tcp   open        ms-sql-s                
9100/tcp   open        jetdirect               

Remote operating system guess: Microsoft Windows NT 4.0

# Nmap run completed at Tue Jul 31 00:59:28 2001 -- 1 IP address (1 host up) scanned in 27 seconds