{"id":40584,"date":"2026-09-04T15:13:03","date_gmt":"2026-09-04T15:13:03","guid":{"rendered":"https:\/\/nodemaven.com\/?p=40584"},"modified":"2026-09-04T15:13:08","modified_gmt":"2026-09-04T15:13:08","slug":"webrtc-leak","status":"publish","type":"post","link":"https:\/\/nodemaven.com\/ru\/blog\/webrtc-leak\/","title":{"rendered":"WebRTC Leak: Is Your Real IP Exposed Behind a Proxy?"},"content":{"rendered":"

A \u0423\u0442\u0435\u0447\u043a\u0430 WebRTC<\/strong> can expose a public IP address that differs from the IP used for normal HTTP traffic. The mismatch often involves UDP traffic<\/strong>: WebRTC may send STUN or TURN connection checks through a route that does not match the configured proxy.<\/p>\n\n\n\n

This guide explains how WebRTC, UDP, STUN, TURN, and HTTP\/3 fit together<\/strong>, how to check whether your browser exposes a second public IP, how to read the results, and how to correct a routing mismatch without blindly disabling browser features.<\/p>\n\n\n\n

\u041a\u0440\u0430\u0442\u043a\u0438\u0439 \u043e\u0442\u0432\u0435\u0442:<\/strong> Connect your proxy in the exact browser profile you plan to use, then run NodeMaven Connection Checker<\/a>. Compare the HTTP exit with WebRTC, STUN, and TURN results. Different public IPs point to a browser, profile, or network routing problem that needs investigation before location-sensitive scraping, automation, or approved account workflows.<\/strong><\/p>\n\n\n\n

\"WebRTC<\/figure>\n\n\n\n

A standard IP checker only confirms the address websites see through HTTP. Connection Checker also tests browser-reported WebRTC, server-observed STUN and TURN routes over UDP and TCP<\/strong>, plus HTTP\/3 status.<\/p>\n\n\n

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Keep Browser Sessions on One Stable IP<\/div>\n \n

Use NodeMaven\u2019s UDP-capable<\/span> ISP \u043f\u0440\u043e\u043a\u0441\u0438<\/span><\/a> for persistent browser profiles and long-running workflows. Use code <\/span>\u0418\u0421\u041f40<\/b> \u043f\u043e\u043b\u0443\u0447\u0438\u0442\u044c <\/span>\u0441\u043a\u0438\u0434\u043a\u0443 40% \u043d\u0430 \u043f\u0435\u0440\u0432\u044b\u0439 \u0437\u0430\u043a\u0430\u0437 \u043e\u0442 3 IP<\/b>.<\/span><\/p>\n<\/div>\n <\/div>\n \n \n \u041f\u043e\u043f\u0440\u043e\u0431\u043e\u0432\u0430\u0442\u044c \u0441\u0435\u0439\u0447\u0430\u0441 <\/a>\n <\/div>\n<\/div>\n\n\n

What Is a WebRTC Leak?<\/strong><\/h2>\n\n\n\n

WebRTC is browser technology used for video calls, voice calls, screen sharing, and direct browser-to-browser connections. Before a connection starts, the browser checks which network routes it can use.<\/p>\n\n\n\n

That process can expose more network information than an ordinary page request. A website may see the proxy IP through HTTP while a WebRTC-related connection exposes another public IP through a separate route.<\/p>\n\n\n\n

How a Browser Can Expose Two Public IP Addresses<\/strong><\/h3>\n\n\n\n

In a consistent setup, both page requests and WebRTC-related traffic leave through the selected proxy:<\/p>\n\n\n\n

Browser -> Proxy -> Website\n\nBrowser -> Proxy -> STUN\/TURN service<\/pre>\n\n\n\n
A possible routing mismatch looks like this:<\/p>\n\n\n\n
Browser -> Proxy -> Website\n\nBrowser -> Local network -> STUN\/TURN service<\/pre>\n\n\n\n
The website sees the proxy IP through HTTP, but a STUN or TURN service sees the local network\u2019s public IP. That second public address is the potential leak.<\/strong><\/p>\n\n\n\n
A mismatch does not automatically mean that the proxy failed. The browser, proxy protocol, operating system, firewall, network policy, and anti-detect profile can all affect the route.<\/p>\n\n\n\n
What STUN and TURN Do<\/strong><\/h3>\n\n\n\n
STUN<\/strong> helps a browser discover the public IP address and port an external server sees. A STUN server records the address from which it receives the browser\u2019s request and returns it as a possible connection route.<\/p>\n\n\n\n
TURN<\/strong> relays traffic when a direct peer-to-peer connection is unavailable. A TURN relay can observe the browser\u2019s connection over UDP<\/strong> \u0438\u043b\u0438 TCP<\/strong>.<\/p>\n\n\n\n
Browser-reported WebRTC candidates and server-observed addresses can differ. Comparing both provides a fuller view of the tested connection path.<\/p>\n\n\n\n
UDP, HTTP\/3, and WebRTC Proxy Leaks<\/strong><\/h2>\n\n\n\n
 What Is UDP and How Does HTTP\/3 Use It?<\/strong><\/h3>\n\n\n\n
Web browsers traditionally load websites through HTTP\/1.1 or HTTP\/2<\/strong>, which use TCP. HTTP\/3 uses QUIC, and QUIC runs over UDP.<\/strong><\/p>\n\n\n\n
W3Techs reports<\/a> that around 40% of websites use HTTP\/3<\/strong>, so browser traffic can regularly include UDP-based QUIC connections.<\/p>\n\n\n\n
\u041f\u0440\u043e\u0432\u0435\u0440\u043a\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u044f<\/a> shows which protocol its HTTP check used:<\/p>\n\n\n\n