While your computer is running, running applications can work in the so-called mode. "listening" to network ports. This is a process in which the port allocated by the program is always open, ready to establish a network connection and receive and transmit data. Open network ports can potentially pose a security threat to your system. Knowing the list of open ports will help you properly configure your firewall and minimize the risk of outside intrusion. To determine open ports, you can use the netstat console utility, which is included with any Windows operating system.
It is necessary
Desktop or laptop with Windows operating system installed
Instructions
Step 1
You need to run Command Prompt. Call the "Start" menu and select the "All Programs" item.
Step 2
In the opened list of installed programs, open the "Accessories" folder. Find and run the Command Prompt program.
Step 3
At the command line, type and run netstat -a | find "LISTENING". The result of the command will be a list of open ports for all network interfaces of your computer with an indication of the communication protocol.
Step 4
Review the resulting list. The open port numbers appear in the second column along with the network interface addresses in the format [network interface address]: [port number].
