: Users have reported that Java 8 Update 251 is the last version where the tool reliably works. Modern updates (like Java 8 Update 281 and higher) typically break the application.
Ensure Windows Firewall is not blocking the tool, as it needs to listen for broadcast packets to find devices on your network. Recommended Modern Alternatives
Instead of the EXE launcher:
"C:\Program Files\Java\jre1.8.0_202\bin\javaw.exe" -jar UBNTDiscoveryTool.jar
A modern replacement for Windows that includes powerful network discovery features without requiring Java. Ubiquiti Device Discovery (Chrome Extension):