Connection Checker

See how detectable your browser and proxy really are. An independent test of your exit IP, WebRTC (STUN/TURN) and HTTP/3 (QUIC) behavior — comparing what your browser reports with what the server actually observes.

Your exit IP (HTTP)

The address every website sees when your browser connects over HTTP.

Detected exit IP
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ISP
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Country / City
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Network (ASN)
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Browser
Chrome 149
Check status
Running

HTTP/3 (QUIC)

Checks whether your connection negotiates QUIC over UDP or falls back to TCP.

Checking…

Negotiated protocol
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WebRTC leak (STUN)

Checks whether WebRTC exposes a different IP than your proxy or VPN over UDP.

Running test…

Collecting ICE candidates from your browser.

Detected public IP
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Public IPv6
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Local LAN IP
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mDNS candidate
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WebRTC verification (TURN)

Confirms the browser-reported address against what our relay server actually observes.

Checking…

Browser-reported WebRTC IP
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Server-observed (STUN source)
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Server-observed (UDP relay)
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Server-observed (TCP relay)
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How anti-bot systems use these signals

A proxy or VPN only hides you if every channel your browser uses agrees on one address. Detection systems do not just read your exit IP, they cross-check the channels below and flag any that disagree.

  • Exit IP: the baseline address every website sees over HTTP. Every other channel is compared against it.
  • WebRTC: browsers can reveal your real IP over UDP even when a proxy covers your normal web traffic. A different IP here is a direct leak.
  • Server-side check: a site can compare the address your browser reports against the one its own server actually receives. An anti-detect browser that rewrites the address is caught here.
  • HTTP/3 (QUIC): QUIC runs over UDP. A connection that cannot carry it and falls back to TCP stands out from the large share of traffic already on HTTP/3.
  • Consistency: a real visitor almost always has a working, matching WebRTC address. A fully blocked or missing one is unusual, so it is treated as a signal on its own.

The takeaway is simple: a well-configured proxy binds all of these channels to the same IP. Any channel that shows a different address, or no address at all, makes you easier to detect.