You configure a proxy inside an antidetect browser, open an IP checker, and see the expected proxy address.
At first glance, the network setup looks correct.
Then you run a WebRTC test and see another address, an unexpected ICE candidate, or a result that does not match the network identity you expected.
That is where Antidetect Browser WebRTC settings start to matter.
WebRTC can expose network information through a different path from a normal page request. A proxy may control the public IP seen by a website while WebRTC still provides additional information about the browser's available network paths.
The important question is not simply whether WebRTC is enabled or disabled.
It is whether the WebRTC-visible network information is consistent with the proxy and browser environment you intended to use.
Why WebRTC Can Reveal More Than a Normal Page Request
WebRTC supports real-time communication such as voice, video, and peer-to-peer data transfer.
To establish those connections, the browser uses ICE, or Interactive Connectivity Establishment, to discover possible network paths between peers. Those paths are represented as ICE candidates.
Depending on the browser, network configuration, and WebRTC policy, candidates can contain information associated with local interfaces, NAT mappings, or relay servers.
The WebRTC specification notes that addresses exposed through ICE can reveal information about location and local network topology and can increase the browser's fingerprinting surface.
For an antidetect browser, the practical problem is consistency.
If a normal page request shows:
Public IP → Proxy A
while WebRTC exposes information associated with another public network path, the browser may be presenting conflicting network signals.
That is more useful to investigate than asking only, "Does WebRTC leak my IP?"
A Working Proxy Does Not Automatically Verify WebRTC
A proxy that correctly handles normal page traffic does not automatically prove that WebRTC ICE checks are using the same network path.
RFC 8828 discusses this exact problem. A browser may use an application proxy for ordinary traffic while direct Internet access is still available. Under some WebRTC IP-handling policies, STUN connectivity checks can then use that direct route and reveal another public address.
This is why checking an IP-detection page alone is not enough.
A practical validation sequence is:
- Check the public IP visible through the browser profile.
- Inspect WebRTC ICE candidates in the same profile.
- Compare the WebRTC-visible network information with the route you intended to use.
- Repeat the check after reopening the profile or changing the proxy.
- Investigate unexpected public network paths instead of assuming that a successful proxy connection proves the entire network setup.
The same profile part matters.
Testing the proxy in one browser and WebRTC in another environment does not prove that the actual antidetect profile is internally consistent.
What WebRTC ICE Candidates Actually Tell You
Not every ICE candidate means the same thing.
MDN's ICE candidate documentation describes several candidate types that are useful when reading a test result.
A host candidate represents an address associated with a network interface.
Some modern browser implementations may avoid exposing the raw private IP address directly and instead represent a local host candidate with an mDNS hostname, often ending in .local.
For example, seeing an mDNS value is not equivalent to a website receiving a raw private address such as 192.168.x.x. The result still needs to be interpreted according to what the browser actually makes visible.
A server-reflexive candidate, usually shown as srflx, represents an address discovered through STUN. In many network configurations, this corresponds to a public-facing address created by NAT.
A relay candidate represents an address supplied by a TURN server. Traffic using that candidate passes through the relay rather than connecting directly between peers.
So seeing an address in an ICE result does not automatically mean you have found a leak.
Ask three questions instead:
- What type of candidate is it?
- What network path does it represent?
- Does it conflict with the network identity this profile is supposed to present?
Inspect WebRTC Candidates Yourself
You can inspect the candidate information exposed to JavaScript with a small test in the browser console:
const pc = new RTCPeerConnection({
iceServers: [
{
urls: "stun:YOUR_STUN_SERVER"
}
]
});
pc.createDataChannel("probe");
pc.onicecandidate = ({ candidate }) => {
if (!candidate) {
console.log("ICE gathering complete");
pc.close();
return;
}
console.log({
type: candidate.type,
address: candidate.address,
protocol: candidate.protocol,
candidate: candidate.candidate
});
};
const offer = await pc.createOffer();
await pc.setLocalDescription(offer);
Replace YOUR_STUN_SERVER with a STUN server you trust for the test.
Modern browsers expose structured properties such as RTCIceCandidate.address and RTCIceCandidate.type, although privacy policies and browser implementations can affect what a page receives.
The raw candidate string can also help when you need to inspect what the browser generated.
This is not a complete anonymity or fingerprint test.
It answers a much narrower question:
What WebRTC candidate information is this browser exposing in this environment?
That is the useful scope when diagnosing WebRTC and proxy consistency.
What Should Match Between the Proxy and WebRTC Result?
There is no single value that every correct configuration must produce.
What matters is whether the visible network information makes sense for the environment you intended to create.
Suppose a browser profile is using a Canadian proxy.
The normal page request shows the expected Canadian exit IP.
If WebRTC then reveals an unrelated public address associated with another direct network connection, that deserves investigation.
If the WebRTC-visible information remains consistent with the intended route, or browser policy prevents an additional direct public route from being exposed, the result is more coherent.
The important concept is consistency, not maximum suppression.
Completely disabling WebRTC is not always an ideal answer either. Browser conferencing, voice or video applications, and peer-to-peer features may depend on it.
The objective is therefore not necessarily to make WebRTC disappear. It is to prevent the feature from presenting network information that contradicts the rest of the browser environment.
Where the Antidetect Browser Fits Into the Network Path
An antidetect browser cannot treat WebRTC as if it were just another configurable fingerprint value like screen resolution or a User-Agent string.
Network identity comes from the active route.
Browser identity comes from the saved browser environment.
Those layers are related, but they are not the same thing.
This distinction also appears in Web4 Browser. Its proxy and network consistency approach treats the saved browser identity and session context separately from network-origin signals such as public IP, DNS behavior, and WebRTC-visible information.
The broader principle applies regardless of product:
A browser fingerprint result cannot replace a network-path test, and a successful proxy connection cannot replace a WebRTC check.
A Clean WebRTC Test Only Verifies One Part of the Environment
Suppose the proxy IP is correct and your WebRTC test exposes no unexpected public address.
That is useful evidence.
But it tells you only about the network information the WebRTC test could observe.
It does not automatically validate Canvas, WebGL, fonts, browser version, timezone, language, DNS behavior, proxy reputation, account history, or the way a website combines those signals.
A WebRTC test also cannot tell you whether a platform will accept an account or whether an IP has a clean reputation.
That is the right boundary for interpreting WebRTC results in an antidetect browser.
Do not ask only:
"Did the browser hide my real IP?"
Ask:
"Does the WebRTC-visible network information agree with the network environment this profile is supposed to present?"
If the answer is yes, you have verified one important layer of the browser environment.
If the answer is no, investigate that network layer before assuming the proxy or browser profile is ready.
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