Open Ports make the clients (Laptop, Mobile etc) devices vulnerable to cyber attacks. It would be good to know the opened ports and take appropriate action like killing an application or removing an app etc.
BANA helps you to find the open ports on your Laptops, Tablets and Mobile Phones using an easy to use interface. Copying the screenshot below. . There are a maximum of 65536 ports that a system can have. You can choose the number of ports to scan using BANA's UI.