The Java-based Ubiquiti Discovery Tool is designed to scan your local network for Ubiquiti devices that may not have an IP address, are on a different subnet, or need to be discovered for initial configuration. 2.5.1 (Standalone JAR format) Requirement: Java Runtime Environment (JRE) Platform: Cross-platform (Windows, Linux, macOS)
: For on-the-go discovery, many pros now prefer using the UISP app on a mobile device connected to the same local network. Ubiquiti Community Quick Troubleshooting Tips
Because modern Windows 10 builds have deprecated WinPcap, you must use . Download the latest version of Npcap.
To get the tool working on a fully updated Windows 10 machine, you must follow these steps to manage the Java environment properly. 1. Download and Install Necessary Java ubnt discovery tool v251 and java on windows 10 updated
: If you avoid standard Oracle Java, Amazon Corretto 8 (an OpenJDK distribution) is a recommended alternative that maintains compatibility.
Locate the primary executable file, which is typically named ubnt-discovery-v2.5.1.jar or wrapped inside a native .exe container. 3. Resolving the "Java Blocked" and Security Errors
Instead of double-clicking the JAR file (which might open with the wrong Java version), create a batch file to explicitly call the older Java. Open Notepad. The Java-based Ubiquiti Discovery Tool is designed to
First, verify if you have Java installed. Open your Command Prompt (cmd) and type:
| Issue | Likely Cause | Solution | | :--- | :--- | :--- | | “Java Exception” persists after installing Java 8 | Multiple Java versions installed; wrong version is being used | Use the isolated JRE method (Method 1) to force the correct version | | No devices appear in the scan | Firewall blocking UDP discovery packets | Temporarily disable firewall, or create an allow rule for UDP port 10001 | | The tool opens but shows an empty screen | Corrupted configuration or missing network interfaces | Delete any leftover config files and re‑extract the tool; run as administrator | | High CPU usage when scanning | The original tool has known CPU‑efficiency problems | Switch to the renewed GitHub version (Method 2), which uses modern threading | | Chrome extension doesn’t find devices | Extension requires same Layer 2 network; devices may be on a different VLAN | Ensure your computer and the Ubiquiti devices share the same broadcast domain |
To use this version:
Ubiquiti’s decision to leave a core utility broken for years while still hosting it for download is disappointing. Fortunately, the networking community is resourceful. With a bit of old‑school hackery or a quick switch to a modern alternative, the tool still runs just fine on modern systems. Choose the method that suits your workflow, and enjoy hassle‑free Ubiquiti device discovery once again.
Do you know the exact you are trying to find?
For advanced users, a lightweight Docker containerized version of the UBNT Discovery Tool CLI is available. This container allows scanning for Ubiquiti devices on the network without installing dependencies directly on the host system. Download the latest version of Npcap
Installing Ubiquiti Discovery Tool on new Windows 10 Pro laptop