System ports range from 0 to 65535 . Ports 0 through 1023 are "Well-Known Ports" reserved for core system privileges and protocols like HTTP (80), HTTPS (443), and SSH (22). 🔍 How to Check for Open Ports on Windows 11
If you see a PID holding a port open and need to know exactly what program it is, you can combine commands to reveal the application name: powershell
To discover which ports are actively listening or established on your PC, you can use native terminal utilities without downloading third-party software. Option 1: Native Command Prompt ( netstat ) windows 11 open ports
A port is labeled "open" or "listening" when a specific software application or system service is actively bound to it, waiting to accept incoming data packets.
Every application communicating over a network relies on a specific transport layer protocol—primarily (Transmission Control Protocol) or UDP (User Datagram Protocol)—and a specific assigned numerical address known as a port. System ports range from 0 to 65535
Look for LISTENING to find open ports waiting for a connection.
Get-Process -Id (Get-NetTCPConnection -LocalPort 443).OwningProcess Use code with caution. 🛡️ How to Open a Port in Windows 11 Firewall Option 1: Native Command Prompt ( netstat )
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.
Press the , type cmd , right-click Command Prompt , and select Run as administrator .
The number in the far-right column belongs to the specific application controlling that port.