Output
Local ICE candidates or mDNS names
UserBenchmark / All Tools / WebRTC Candidate Test
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WebRTC Candidate Test
Inspect browser ICE candidates and whether local addresses are masked with mDNS.
Free to useNo downloadNo sign-up
WebRTC Candidate Test · At a glance
Quick answer: Inspect browser ICE candidates and whether local addresses are masked with mDNS. The check uses no external STUN server.
WebRTC Candidate Test
The test loads when you open it. Device access is requested only after you choose to start.
Detailed guide
How to use this tool
- Start the temporary ICE gathering check and inspect the candidate addresses or mDNS names exposed by the browser.
Input
Temporary candidate gathering
Browser requirement
RTCPeerConnection; no external STUN service
Processing
Runs on your device; no tool-result upload
How it works and what the result means
Host candidates often use mDNS names instead of private addresses. This test does not use an external STUN service, so it cannot determine your public WebRTC address or prove VPN leak protection.
Reading the result
The check uses no external STUN server. It can show host candidates, but cannot compare a public server-reflexive address against a VPN exit address.
What local ICE candidates show
A temporary peer connection gathers candidates without an external STUN server. They may expose private addresses or mDNS names depending on browser privacy controls. This cannot compare a public server-reflexive WebRTC address with a VPN address. Gathering stops and the connection closes after the check.
What to check next
Restricted browsers may expose only mDNS names or no candidates. Missing addresses are not automatically proof of a fault.
Compare these candidates with your browser privacy settings. A missing address may simply mean candidate gathering is restricted.
Frequently asked questions
Does passing this prove my VPN cannot leak?
No. This limited local-candidate check cannot certify VPN protection across all browser and network paths.
How do I start the WebRTC Candidate Test?
Start candidate gathering to inspect the ICE addresses exposed by this browser. Gathering stops automatically.
Does this tool require a download or an account?
No. Open the interactive tool above in a modern browser. The instructions and explanations are available even with JavaScript disabled; running a test needs JavaScript.
Why can two attempts give different results?
Power settings, background tasks, browser scheduling, operating-system input processing and device settings affect measurements. Compare repeated attempts with identical settings rather than the single highest score.