Microsoft Loopback Adapter Windows 11 May 2026

Developers testing client-server applications (e.g., an SQL database and a frontend app) can install multiple loopback adapters, each with a different IP range (e.g., 192.168.1.10, 10.0.0.5). This simulates a multi-segment network without any hardware.

Installing the adapter is only half the battle. By default, the loopback adapter tries to obtain an IP via DHCP, but since it is not connected to a physical network, it will eventually assign an Automatic Private IP (APIPA) like 169.254.x.x. For most use cases, you need a static IP.

Some legacy industrial or medical software expects to see a specific network adapter (e.g., a 3Com card). The Microsoft Loopback Adapter can mimic its presence. microsoft loopback adapter windows 11

For scripted deployments or IT professionals, use PowerShell as Administrator:

# Rename the adapter for clarity (optional)
Get-NetAdapter -Name "Ethernet*" | Where-Object InterfaceDescription -like "*KM-TEST*" | Rename-NetAdapter -NewName "Loopback"
New-NetIPAddress -InterfaceAlias "Loopback" -IPAddress 192.168.100.1 -PrefixLength 24
 Developers testing client-server applications (e

To verify:

Get-NetIPAddress -InterfaceAlias "Loopback"

The Microsoft Loopback Adapter remains a useful testing tool in Windows 11, though Microsoft has hidden its installation behind legacy hardware wizards. Use hdwwiz.exe /c for a straightforward install, assign a static IP, and leverage it for local development, virtualization, or software compatibility testing.

Quick reference commands:

# Install
hdwwiz.exe /c