Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       User       Inode       PID/Program name
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      0          4449        917/cupsd       
tcp        0      0 0.0.0.0:17500           0.0.0.0:*               LISTEN      1000       8599        1291/dropbox    
tcp6       0      0 ::1:631                 :::*                    LISTEN      0          4448        917/cupsd       
udp        0      0 0.0.0.0:68              0.0.0.0:*                           0          416743      6012/dhclient   
udp        0      0 0.0.0.0:17500           0.0.0.0:*                           1000       8595        1291/dropbox    
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           104        3995        728/avahi-daemon: r
udp        0      0 0.0.0.0:45812           0.0.0.0:*                           104        3996        728/avahi-daemon: r