Any traffic sent out through this virtual adapter is immediately received back by the same machine. This creates a standalone network environment entirely within the Windows 11 operating system, isolated from external hardware.

Choose the option "Install the hardware that I manually select from a list (Advanced)" and click Next .

Installing the loopback adapter in Windows 11 is not done through the standard "Add Network" settings. Instead, it requires the because it is considered a "legacy" driver. Steps to Install:

Sales engineers or trainers often need to demonstrate software that requires a "network license server." By assigning a static IP to a loopback adapter that matches the license server’s expected IP, the demo runs perfectly offline.

When using VMware Workstation, VirtualBox, or Hyper-V, you sometimes need a bridge between the host (your Windows 11 PC) and the guest VM that does not rely on a physical NIC. Installing a loopback adapter on the host allows virtual machines to communicate with the host via a consistent, predictable IP address.

Scroll down and choose → Next .

Common development use cases include:

At its core, the Microsoft Loopback Adapter is a software-based network interface. Unlike a physical network card that connects to a router or switch, this adapter creates a closed circuit within your computer, causing all traffic sent to it to be immediately routed back, or "looped back," to the local machine. Its primary purpose is to simulate a network environment for testing and development without requiring an actual network connection.

This setup is particularly useful when:

In Windows 11, the old "Add Legacy Hardware" wizard is still available:

In Windows 11, the adapter must be installed manually via the Add Hardware Wizard Method 1: Device Manager Installing the Microsoft Loopback Adapter in Windows

Click Next through the prompt, and finally, click Finish .

Press Windows Key + R , type ncpa.cpl , and hit to open Network Connections.

Microsoft renamed the adapter beginning with Windows 8. Look for Microsoft KM-TEST Loopback Adapter instead. If you still don't see it, ensure your Device Manager's "View" menu has "Show hidden devices" checked, as some Windows 11 versions hide certain network devices by default.