Given a port number how can we find which process is using it? Through the three methods you have learned in this article, you can easily view which TCP port a specific process on Linux is listening upon. Using Built-In Tools to See What is Listening on a Port. Here’s how you can see what’s preventing Windows from safely ejecting a USB drive. It’s a pretty straightforward scenario how you find the running process’s port number when you know the process ID. Download the Process Explorer tool from Microsoft. To find the process which is using the Serial (COM) Port, follow the steps below. Select the Details tab and change the value in the Property field to Service . Here Port 80 is used by Apache ( httpd.exe ) About Albin Sebastian . Because a program already uses this specific port, another program is prevented from using that same port. The other port addresses are used for other applications. If the Telnet connection can be opened, normally the banner of the application which opens the port will be shown, and help user to identify which process that actually listening on the port. Even better, is there a way to log which ports / addresses a process connects to? Here’s a few built-in commands and how to guide that can help users to find out and identify which application or process that is already using, opening and listening on port 80 or 443 on the Winodws operating system such as Windows Vista, Windows XP, Windows 7, Windows Server 2003 and 2008. The first step is to use a command-line tool to see what ports are in use, and use a special flag that tells us which port is assigned to each Windows process identifier number. How do I determine what is using port 80? With this feature, you can find the specific port that a program currently uses. Find which application/service is running in a port – Windows. Thus process ID 975 of the program MySQLd is listening on port number 3306. I am a Technology Blogger, System Administrator by profession and webmaster by passion. To determine what executable is running as a process ID, open Windows Task Manager and switch to the Processes tab. What we didn't do was learn how to tell which processes were associated with each open port.. Often you'll know which applications are going to be using a particular port, because it's the standard one, or because you know you set it up. Open Device Manager and expand Ports (COM & LPT). Check Also. NOTE: Check only for TCP or UDP protocols as port 80 is TCP/UDP. SMTP (Simple Mail Transfer Protocol) uses port 25 etc. Port number 1 to 1024 are reserved for these system tasks purpose. But is there a PowerShell command or .NET object I can use to find which ports a specific process is using? Regards, The output shows that the process ID 975 corresponds to the program names MySDLd. vmware data protection (VDP) ip/dns could not be resolved The number, which is shown at the last column of the list, is the PID (process ID) of that application. - How to check which process/application is using a particular port on Windows - How to check which port is being used by a particular process/application on Windows. I know things like netstat will show open and listenting ports on a machine. But after the Windows update on 10 May 2017, there was a process called "System" ( NT Kernel & System ) PID 4 used port 80, So I can not use Apache on port 80. Start Windows Task Manager and select the Processes tab. Then we can use that number to look up exactly which process … In the Select Columns dialog, turn on the PID (Process Identifier) check box and then click OK. Use the command line and Task Manager to check the ports. ... Now you can see the application with process ID. You can combine the netstat and tasklist commands to determine what process is using a port on the Windows Server. "System" process with PID 4 use port 80 I use Windows 10 and Apache which run on port 80. With Windows it is as easy as using netstat and tasklist commands.