Situatie

Step 1: Open CMD or Command Prompt

• Press Win + R from your keyboard > Type cmd > Click on the Enter button

Step 2: Implement the “netstat” Command

An effective tool for keeping an eye on open ports within the system and configured network connections is the netstat command to simplify. It offers comprehensive details on all open connections and system servers, such as the protocol in use, and local and international addresses to control or verify all the connection’s status.

• Type the below command in the cmd to check the open port functions > Press Enter

netstat -an | find "LISTEN"

• See the output below

TCP    0.0.0.0:135        0.0.0.0:0        LISTENING
TCP    0.0.0.0:445       0.0.0.0:0        LISTENING
TCP    0.0.0.0:902       0.0.0.0:0        LISTENING

In this case, 0.0.0.0 designates that all pre-processed network interfaces are listening on the port, which is open for the internal system server. The port number is the number that comes after the colon of the system commands (e.g., 135, 445, 3389).

Step 3: Observe the functional Process using the Port

• Write the following command to identify which application or process is using a specific port within the system.

netstat -ano | find "LISTEN"

An extra -o flag is included with this command while processed, which shows the Process ID (PID) connected to each port manually.

• See the output within a PID column

TCP    0.0.0.0:135        0.0.0.0:0        LISTENING      1160
TCP    0.0.0.0:445       0.0.0.0:0        LISTENING      4

• Search and Open Task Manager > Go to Details option > See the PID column

Step 4: Check Specific Port in cmd

• You can change the implemented command to focus on a particular port if you want to see if it’s open or not within the system configuration. For instance, use this to see if port 60 is open to identify the process:

netstat -an | find ":60"

• See the final entry below –

TCP    0.0.0.0:40         0.0.0.0:0        LISTENING

Solutie

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