Windows 11 Open Ports !!top!! Jun 2026

You will see a list of connections. The number after the colon ( : ) in the local address column is the open port number. The final number on the right is the PID (Process Identifier) using that port. Method 2: Using PowerShell

Select TCP or UDP (usually TCP for applications). Under "Specific local ports," enter the port number (e.g., 80 , 3389 , or 25565 ). Action: Select Allow the connection .

Opening ports exposes your computer to potential security threats. Follow these best practices: Do not leave unused ports open. windows 11 open ports

Open the , type Windows Defender Firewall , and press Enter .

Port 135 is the RPC Endpoint Mapper. It acts as a directory service for DCOM (Distributed Component Object Model) applications. When a client wants to communicate with a remote Windows service (like the Registry or Service Control Manager), they first query port 135 to find the dynamic port assigned to that service. You will see a list of connections

Open a web browser and type your router’s gateway IP address (usually 192.168.1.1 or 192.168.0.1 ). Log in using your router’s administrative credentials.

Before opening a new port, verify whether it is already open or in use by another application. Method 1: Using Command Prompt (netstat) Method 2: Using PowerShell Select TCP or UDP

Get-NetFirewallPortFilter | Where-Object $_.LocalPort -ne $null | Select-Object -First 20

Ports themselves are not inherently dangerous. However, if a software service listening on an open port has a security flaw, unauthorized actors could exploit that vulnerability to gain access to your computer.