Table of contents

Introduction

In this step-by-step guide, you'll learn how to detect and fix WebRTC IP address leaks while using a proxy. We'll cover why WebRTC leaks can pose privacy risks, how to check for them, and ways to close them effectively in popular browsers, through extensions, and in anti-detect browsers. We will also show you how to properly configure settings with mobile proxies and verify that there are indeed no leaks. By the end, you’ll have a checklist, common mistakes analysis, advanced tips, and answers to frequently asked questions. By following the instructions precisely, you will go from zero to steady results without guesswork or experiments.

This guide is suitable for beginner users and professionals who want to swiftly and reliably eliminate leaks, as well as advanced users who care about fine-tuning, profile replication, and predictable test outcomes. Previous knowledge is not required. You just need to know how to use a browser and understand what a proxy server is.

What you need to know in advance: WebRTC is a browser technology that can expose external and local IP addresses during the connection candidates exchange (ICE). This can reveal your real IP behind a proxy if you don't take action. We will explain all concepts in simple terms in the "Basic Concepts" section.

Time required: a basic check and closure of the leak in one browser will take 40–60 minutes; adding extensions, working with anti-detect browsers, and final tests might take an additional 20–30 minutes. If you're setting up multiple browsers and profiles at once, plan for about 90–120 minutes.

Preparation

Before starting, make sure you have everything you need and understand how we will check the results. This stage will reduce the risk of errors and save you time.

Required Tools and Access

  • Access to a working browser on your computer (Chrome, Edge, Firefox, Opera, or Safari).
  • Access to the settings of the proxy you’re using (HTTP(S) or SOCKS5). If you’re working with a mobile proxy, prepare access from your provider’s dashboard. An example of such a service is mobileproxy.space.
  • Willingness to install an extension to manage WebRTC (for example, an extension that restricts or disables WebRTC in Chromium browsers) and uBlock Origin for extra protection.
  • If using an anti-detect browser: access to your account and the profile settings panel.

System Requirements

  • Windows 10/11, macOS 12+, or a modern Linux distribution.
  • Up-to-date versions of browsers (current updates as of 2026). Update your browser before starting.
  • A stable internet connection.

What to Download and Install

  • The browser(s) you plan to work with.
  • An extension for limiting WebRTC for your Chromium-based browser (like WebRTC Control or WebRTC Leak Prevent). Also, install uBlock Origin and enable the WebRTC leak prevention feature if it's available in your settings.
  • An anti-detect browser (if necessary), if you are working with profiles. Examples: AdsPower, Dolphin{anty}, Incogniton, GoLogin, Octo Browser, etc.

Backups

If you are working with an anti-detect browser or a corporate profile, export or save the current profile settings before making changes. If changing system policies or browser flags, document the original values.

⚠️ Attention: Before changing hidden browser settings (like about:config in Firefox or flags in Chromium browsers), write down the current values. This will allow you to revert back if a site stops functioning as expected.

✅ Check: At this stage, you should have: access to the browser, access to the proxy, a list of extensions to install, and backups (if you are changing profiles or policies).

Basic Concepts

Key Terms in Simple Language

  • WebRTC — a browser technology for real-time audio, video, and data exchange. To establish a WebRTC connection, it exchanges "candidates" of network routes (ICE), including through STUN/TURN.
  • ICE Candidates — potential paths for communication between two parties. These can include public and local IP addresses.
  • STUN/TURN — auxiliary servers that help discover your public IP, determine routes, and establish connections even behind NATs and firewalls.
  • mDNS — a method to hide your local IP when issuing ICE candidates by replacing local addresses with temporary mDNS identifiers.
  • Proxy — an intermediary server through which your HTTP(S) or SOCKS5 traffic routes. A proxy masks your real IP from the sites you visit.

Why WebRTC Leak Occurs

Even if your browser is configured to work through a proxy, WebRTC may bypass the HTTP(S) route and reach a STUN server via UDP to obtain the public IP of your internet connection. This data can then be visible to scripts on the page. Consequently, the website can discover your real IP despite the proxy. This is what we call a WebRTC leak.

What’s Important to Understand Before Starting

  • Disabling WebRTC entirely may break audio and video calls, screen sharing, and other features.
  • The aim of this guide is not to “break WebRTC,” but to ensure that your real IP doesn’t get exposed. Where possible, we will use “gentle” methods: mDNS, limitation to the public interface, ICE candidates rules.
  • Different browsers provide different levels of control. Firefox allows for fine-tuning through about:config. In Chromium browsers, it’s more effective to use an extension or policies.

Tip: If your work doesn’t require WebRTC features (calls, file transfers in the browser), consider a stricter disable in a profile specifically for privacy-critical tasks.

Step 1: Identify Proxy Context and Environment

Goal of this step: to understand how traffic flows from your browser and where WebRTC might bypass the proxy.

Detailed Steps

  1. Open the browser in which you are working through a proxy.
  2. Check the active proxy configuration. For Chromium-based browsers, go to Settings: Settings — System — Open your proxy settings. Ensure your proxy server, login, and password (if required) are specified.
  3. If you are using a profile in an anti-detect browser, open the profile settings and ensure the proxy is specified there: type (HTTP, HTTPS, or SOCKS5), host, port, and login/password if necessary.
  4. Document the current external IP that websites see through your proxy. Type "my ip" in the search bar, and open any service that shows the external IP. Note down this IP as "IP via Proxy."
  5. If you have a mobile proxy, check your provider’s control panel. For example, in mobileproxy.space, verify the IP address, region, authorization method (by login/password or by a list of allowed IPs), and the IP rotation status.

Important Points

  • Proxy ≠ WebRTC. The proxy manages HTTP(S)/SOCKS traffic, while WebRTC can reveal IPs during the ICE exchange.
  • We need to ensure that any WebRTC candidates do not disclose your real public and local IP.

⚠️ Attention: If you use corporate policies for the browser, any changes to flags or extensions may be overridden by the administrator. Check if you have any centralized policies that disable the options you need.

Tip: Immediately create a notebook for notes: "IP via Proxy", "Date and Time", "Profile Name", "Extension and Version". These notes will help quickly replicate settings or debug issues.

✅ Check: You have documented the IP visible through the proxy, and you understand where and how the proxy is set up in the browser or profile.

Potential Problems and Solutions

  • Problem: The browser is not using the proxy. Reason: Incorrect address or port specified. Solution: Check the format of the protocol type, host, port, login/password.
  • Problem: The proxy requires authentication, but the browser doesn’t ask for login/password. Reason: Incorrect authentication scheme. Solution: Enter the details manually in the profile or set them in the system settings.

Step 2: Check WebRTC Leaks in Desktop Browsers

Goal of this step: to confirm whether a leak exists before starting the setup.

Detailed Steps

  1. Open a browser window in normal mode. If extensions are enabled in the browser, temporarily disable them for a clean test.
  2. Open any service that shows WebRTC detector results in the browser. Perform the test. Pay attention to two types of addresses: public IP candidate and local IP candidates (for example, addresses like 192.168.x.x, 10.x.x.x, or 172.16–31.x.x).
  3. Compare the public IP shown by the WebRTC detector with the "IP via Proxy" you noted earlier. If they differ, and WebRTC shows your real provider IP — this is a leak.
  4. If local IP candidates are visible explicitly, this is also a potential leak, as the site could use this data for fingerprint correlation and unique identification.
  5. Document a screenshot of the results or note down the public and local addresses shown by the test. You’ll compare these with the outcomes after configuring.

Important Points

  • Test each browser separately. Don’t make a conclusion based on one browser for all.
  • Results depend on versions and enabled features, particularly in Safari and Firefox.

Tip: Perform the test in incognito mode and in normal mode. Sometimes extensions are disabled in incognito, and you'll see the "bare" picture.

✅ Check: You have documented the results before configuration: what public and local addresses WebRTC is currently showing. This is your starting point.

Potential Problems and Solutions

  • Problem: Tests show different results on different sites. Reason: Different testing methodology, cache, and WebRTC policy. Solution: Compare multiple results; the key is that your real public IP doesn’t appear anywhere.
  • Problem: Nothing shows up. Reason: The site did not receive permission or the test is incorrect. Solution: Refresh the page, allow access to media devices when prompted, or use an alternative tester.

Step 3: Closing WebRTC in Browsers Natively

Goal of this step: to minimize or eliminate leaks using built-in browser settings without extensions where possible.

Chromium-Based Browsers (Chrome, Edge, Opera, Brave, etc.)

  1. Open the browser settings. Go to the "Privacy and Security" section — "Site Settings" — "Additional Permissions" (names may vary). Look for sections related to camera and microphone. Although this does not turn off WebRTC, denying media access reduces real cases where ICE exchange occurs during calls.
  2. Open the flags page (chrome://flags or edge://flags, opera://flags). Find the parameter responsible for anonymizing local IPs in WebRTC (e.g., "Anonymize local IPs exposed by WebRTC" or "mDNS ICE candidates"). Change it to Enabled. Restart the browser.
  3. Check corporate policies (if applicable). In policy environments, you can set WebRtcIpHandlingPolicy to "default_public_interface_only" or "disable_non_proxied_udp" to prevent direct non-proxy UDP connections. This step isn’t necessary for standard users.

Firefox (Desktop)

  1. Type about:config in the address bar and confirm that you understand the risks.
  2. Find the parameter media.peerconnection.enabled and, if you don’t need calls through the browser, set it to false to completely disable WebRTC. If calls are needed, do not disable it globally and use the following parameters.
  3. Set media.peerconnection.ice.no_host to true to prevent local IP addresses from being shared as ICE candidates.
  4. Set media.peerconnection.ice.default_address_only to true to limit candidates to default addresses only, not all interfaces.
  5. Set media.peerconnection.ice.obfuscate_host_addresses to true to enable mDNS hiding of local addresses.
  6. Restart Firefox.

Safari (macOS, iOS/iPadOS)

  1. On macOS, enable the "Develop" menu (Safari — Preferences — Advanced — Show Develop menu in menu bar).
  2. In the "Develop" menu, go to "Experimental Features" and check the options related to mDNS ICE candidates. Enable mDNS ICE candidates to ensure local IPs aren’t exposed directly.
  3. In Site Settings, restrict access to the camera and microphone for unnecessary sites so that WebRTC does not activate unnecessarily.
  4. On iOS/iPadOS, in "Settings — Safari — Extensions/Experimental Features", enable the equivalents of mDNS ICE candidates if available, and limit access to the camera/microphone for sites.

⚠️ Attention: Completely disabling WebRTC may break web calls, screen sharing, and some corporate applications. If you need call functionality, use mDNS mode and candidate limitation instead of fully turning it off.

Tip: If you frequently switch networks and interfaces (like Ethernet and Wi-Fi), review the flags and about:config settings after browser updates. Sometimes updates reset experimental features.

✅ Check: Run a test from the previous step. Local IPs should not show explicitly, and the public candidate should not match the real provider IP. If the test still shows your real IP, move on to the step involving extensions.

Potential Problems and Solutions

  • Problem: There’s no option for anonymizing local IPs in Chromium flags. Reason: Browser version or policy. Solution: Use a WebRTC extension and uBlock Origin, or apply a system-level policy (available for administrators).
  • Problem: Firefox breaks calls after disabling WebRTC. Reason: You disabled media.peerconnection.enabled. Solution: Enable it again and apply the no_host, default_address_only, and obfuscate_host_addresses parameters.

Step 4: Closing WebRTC with Extensions

Goal of this step: to achieve predictable behavior in Chromium browsers and add an extra level of protection.

Detailed Steps

  1. Open your browser’s extensions directory. Find and install an extension that manages WebRTC policy (e.g., WebRTC Control or WebRTC Leak Prevent). These extensions allow you to set a strategy: "Default public interface only", "Disable non-proxied UDP", etc.
  2. After installing, open the extension settings. Choose a policy that hides local candidates and blocks non-proxied UDP. In the interface, this might be called "Disable non-proxied UDP" or "Use default public interface only". Save the settings.
  3. Also install uBlock Origin. Open its settings and in the "Settings" section, enable the option that prevents WebRTC leaks (if available in your version). This is an additional safeguard.
  4. Restart the browser or toggle the extensions off and on to ensure the policy is applied.

Important Points

  • The extension should be allowed in both normal and private windows if you’re testing both modes. Check the permissions of the extensions.
  • Some sites that use WebRTC for streaming may work differently after enabling strict policies. Assess the impact on your scenarios.

⚠️ Attention: Do not install extensions from unverified sources. Permissions to access "site data" grant the extension wide-ranging capabilities. Use only trusted stores and developers.

Tip: If you switch between multiple policies (e.g., for calls and everyday work), create two browser profiles: "Work (Strict WebRTC)" and "Calls (Moderate WebRTC)".

✅ Check: Repeat the WebRTC test. The public IP should not match your real provider IP, and local IPs should not be visibly exposed. If the result is negative — the leak is closed.

Potential Problems and Solutions

  • Problem: The extension doesn’t work in incognito. Reason: It’s disabled in private mode. Solution: Open "Manage Extensions" and enable "Allow in incognito".
  • Problem: The calling site stopped connecting. Reason: Non-proxied UDP is blocked. Solution: Create a separate profile with a more lenient policy or temporarily uncheck the box for the needed domain.

Step 5: Configuring WebRTC in Anti-Detect Browsers

Goal of this step: to achieve reproducible results while working with multiple profiles where fingerprinting and behavior stability matter.

Detailed Steps (Universal Scheme)

  1. Open the management panel of your anti-detect browser (for example, AdsPower, Dolphin{anty}, Incogniton, GoLogin, Octo Browser, etc.).
  2. Create a new profile or open an existing one. Look for the "WebRTC" or "Network/Media/Fingerprinting Settings" section inside the profile.
  3. Select a WebRTC strategy: typically available options are "Disabled", "Real", "Altered/Fake", "Default public interface only", "Proxy only", or similar. If you don’t need calls and want maximum privacy, choose "Disabled" or an option that excludes local candidates and prohibits non-proxied UDP. If calls are needed, use "Proxy only" or "public interface only" plus mDNS, if supported in the anti-detect browser's core.
  4. Specify the proxy within the profile: type (HTTP(S) or SOCKS5), host, port, login/password. Check the connection through the built-in "Test" button (usually, there’s a check in the profile).
  5. Save the profile and launch it. Open a WebRTC tester and ensure that your real IP is not visible. Record the result.

Important Points

  • Anti-detect browsers often have WebRTC parameter mimicry: generation of ufrag, ICE password, SDP fields. Try not to alter values unnecessarily. Your goal is to block leaks, not to create exotic deviations from the norm.
  • Identical WebRTC policies across different profiles will ensure consistent behavioral patterns on sites.

Tip: Create a profile template with an already configured WebRTC policy and proxy. Clone it for new working profiles. This saves time and reduces the risk of errors.

✅ Check: Inside each running profile, repeat the test. Your real public IP should not show, and local IP candidates should be hidden or replaced by mDNS.

Potential Problems and Solutions

  • Problem: The profile shows a different WebRTC result each time it runs. Reason: Random generation of parameters. Solution: Fix the WebRTC mode to "Disabled" or "Proxy only" and do not change it between runs.
  • Problem: An extension in the profile conflicts with the anti-detect policy. Reason: Duplicate settings. Solution: Either use the anti-detect policy or the extension, but do not change the same one simultaneously.

Step 6: Linking with Mobile Proxy

Goal of this step: to successfully combine closing WebRTC with a mobile proxy to ensure the final configuration is clean and stable.

Detailed Steps

  1. Prepare access to the mobile proxy. In your provider's dashboard (e.g., mobileproxy.space), check the connection parameters: node address, port, proxy type, authentication (login/password or approved IP list).
  2. If the provider supports IP rotation, determine how and when rotation occurs. Ensure you can replicate the test after rotation.
  3. In your browser or anti-detect profile, specify the mobile proxy: type (HTTP(S)/SOCKS5), host, port, login/password. Perform a connection test (there's usually a "Check Proxy" button, or visit any site to see if the page loads).
  4. Ensure the WebRTC policy is already configured: in the Chromium browser — through the extension and local IP anonymization flag, in Firefox — through about:config, in the anti-detect browser — through the profile.
  5. Open a WebRTC tester. Check which public IP is shown as a candidate. It should match the mobile proxy's IP, not your real provider's IP. Local IPs should be hidden or represented through mDNS.

Important Points

  • Mobile proxies often provide additional variability in the network (operator, region). This is useful but increases the demands on the predictability of WebRTC settings.
  • Avoid changing multiple parameters at once: first close the leak, then enable IP rotation and other functions.

Tip: If geographical attachment is crucial in your tasks, fix the region on the mobile proxy side (for example, in mobileproxy.space) and do not mix Wi-Fi and cellular networks when used simultaneously.

✅ Check: The test shows the public IP of the mobile proxy, not your real IP. Local addresses should not be visible directly. After rotation of the mobile proxy IP, a repeat test should show the new public IP, while your real provider IP remains hidden.

Potential Problems and Solutions

  • Problem: The test shows the real IP instead of the mobile one. Reason: Non-proxied UDP is enabled or the extension hasn't been applied. Solution: Check the WebRTC policy in the extension and about:config, restart the browser, and ensure the profile is using the mobile proxy.
  • Problem: After IP rotation, results are unstable. Reason: Cache or rotation delay. Solution: Clear the cache, restart the browser, wait for confirmed rotation in the provider's dashboard, then repeat the test.

Step 7: Additional Control Techniques at the Browser and System Levels

Goal of this step: to strengthen predictable behavior without compromising legitimacy and convenience of use.

Detailed Steps

  1. Check site permissions: Settings — Privacy and Security — Site Settings — Permissions. Limit auto-access to camera and microphone; require prompts before using them.
  2. Create a separate profile for tasks requiring enhanced privacy. In this profile, use a strict WebRTC policy and the minimum set of extensions.
  3. If you are an administrator, apply browser policies to centrally set the WebRTC policy. This step is not necessary for users without admin rights.
  4. Check after updates: sometimes browsers change the default behavior of mDNS or WebRTC flags. Do a control test once a month.

Important Points

  • Even with a strict policy, extensions might disable themselves due to failures or conflicts. Regular checks are your friend.
  • Anti-detect browsers update frequently. After updating the kernel, review the functioning of the WebRTC plugin and profiles.

Tip: Establish a routine: "New profile — immediately test WebRTC", "Browser update — immediately test WebRTC", "Changed proxy or operator — immediately test WebRTC". This takes 1-2 minutes but saves hours.

✅ Check: You’ve confirmed that the new organizational routine and policies are working: tests do not show real IP in any profile and after updates.

Potential Problems and Solutions

  • Problem: The extension reset its settings after an update. Reason: Configuration reset. Solution: Export the extension settings to quickly import them upon reset.
  • Problem: Browser policies are unavailable. Reason: No admin rights. Solution: Use an extension and profile strategy without system policies.

Step 8: Diagnosis Using Multiple Tests

Goal of this step: to learn how to check results using different methods and identify discrepancies.

Detailed Steps

  1. Repeat the WebRTC test on two or three different websites. Verify that your real provider IP isn’t exposed anywhere, and local IPs are not explicitly shown.
  2. Perform a simple network test at the DNS level. Open the command prompt. On Windows, run: nslookup -type=txt o-o.myaddr.l.google.com 8.8.8.8. On macOS/Linux, run: dig +short TXT o-o.myaddr.l.google.com @8.8.8.8. Ensure that the returned address corresponds to the route through the proxy network; if you have a system proxy or tunnel set. If the proxy is set only in the browser, this test may display your real IP, which is normal at the system level.
  3. Test access to the camera and microphone on sites where they are actually needed. Verify that calls work if you’ve intentionally chosen a "moderate" WebRTC strategy.

Important Points

  • The DNS level test does not replace the WebRTC test but helps to understand where system traffic goes outside the browser.
  • The main metric for us is that JavaScript on the page does not see your real public IP.

Tip: Keep a log of tests: date, browser, profile, result, notes. This will help identify rare regressions after updates.

✅ Check: All browser-level tests yield consistent results: the real IP is not disclosed, and local IPs are not explicitly published.

Potential Problems and Solutions

  • Problem: Different WebRTC testers show different fields. Reason: Varying depth of collection. Solution: Focus on the key — appearance of the real public IP or local IP candidates; don’t get hung up on secondary metrics.
  • Problem: Occasional leak spikes. Reason: Extension turned off or policy didn’t apply. Solution: Restart the browser, check the extension permissions, and repeat the test.

Result Check

Checklist of What Should Work

  • The WebRTC test in your main browser does not show your real public provider IP.
  • Local IP addresses are not explicitly visible or replaced with mDNS candidates.
  • If using a mobile proxy, the public IP candidate matches the mobile proxy’s IP.
  • When the mobile IP rotates, the test result changes to the new public IP without revealing the real provider IP.
  • Calls and necessary features work in the profile with a moderate WebRTC policy (if required for your task).

How to Test

  1. Run the final configuration: browser/profile with the proxy and WebRTC policy enabled.
  2. Open the WebRTC tester and document the results.
  3. If using a mobile proxy, try to rotate the IP if possible and repeat the test.
  4. Compare with your initial notes. Make sure that the real IP does not appear in any case.

DNS Leak Test

For internal DNS level checks, use the general principle: perform system commands from the previous step or use any reliable DNS leak checking service. It’s important to understand: if the proxy is set only in the browser, a system DNS test may show your real IP — this is normal and does not indicate a browser WebRTC leak. In the context of this guide, the browser WebRTC test remains the key source of truth. To quickly return to the DNS checks description, use the internal link DNS leak test.

Tip: If you are creating unified team documentation, insert your "before" and "after" screenshots with comments. This will become a standard and simplify onboarding for new employees.

✅ Check: All checklist items are confirmed; browser tests do not reveal the real IP; upon rotation of the mobile proxy, only the public IP candidate of the proxy changes.

Common Mistakes and Solutions

  • Problem: After all steps, the real IP is still visible in one of the testers. Reason: The extension didn’t gain permissions in private mode or the policy didn’t apply. Solution: Enable the extension for private windows, restart the browser, check the flags and about:config, and repeat the test.
  • Problem: Calls are missing in the browser. Reason: WebRTC is completely disabled. Solution: Enable WebRTC but hide local IPs and use mDNS; only block non-proxied UDP.
  • Problem: Anti-detect profiles yield different results. Reason: Different WebRTC modes or varied extensions. Solution: Create a profile template, sync the WebRTC mode, and document the list of extensions.
  • Problem: The leak returned after a browser update. Reason: Flags/settings were reset. Solution: Conduct a quick audit of settings, import the saved config, and check with tests.
  • Problem: No leak on one site, but there is one on another. Reason: Different testing methodologies, possibly direct STUN calls. Solution: Ensure "Disable non-proxied UDP" is enabled, check uBlock Origin, and review extension permissions.
  • Problem: The mobile proxy changes IP, and the test sometimes shows intermediate values. Reason: Rotation took time, cache. Solution: Wait for the rotation to complete, clear the cache, refresh the page, and repeat the test.
  • Problem: OS-level policies prevent the required flags. Reason: Corporate policy. Solution: Contact the administrator or use a supported path with extensions without conflicts.

Additional Features

Advanced Settings

  • Chromium Enterprise Policy: centrally set WebRtcIpHandlingPolicy to "default_public_interface_only" or "disable_non_proxied_udp" for all workstations.
  • Firefox about:config: combine mDNS and blocking host candidates to minimize signatures.
  • Anti-detect: fix the engine’s version and WebRTC policy in the template to quickly recheck only one benchmark profile when the engine updates.

Optimization

  • Reduce the number of extensions. One profile WebRTC extension plus uBlock Origin is sufficient in most cases.
  • Separate profiles by purpose: a strict profile for privacy, a moderate one for calls.

What Else Can Be Done

  • Create a regulation for the team: who checks the tests after updates and when.
  • Digitize results: maintain logs of tests in a common repository to observe dynamics and exclude random regressions.

Tip: If your proxies or providers change often, create a small checklist of 6-8 lines and keep it handy. This speeds up everyday operations.

FAQ

1. Why can WebRTC still show my real IP behind a proxy?

Because WebRTC uses ICE candidates and STUN, which can operate bypassing the HTTP(S) route, including non-proxied UDP. Without special measures, the browser might reveal your public provider IP.

2. Is disabling WebRTC enough?

This is radical and resolves the leak, but breaks calls and some applications. It’s better to use modes with mDNS, local IP restrictions, and non-proxied UDP blocking if you need WebRTC functionality.

3. Are both an extension and flag edits needed at once?

Often an extension is enough. However, having mDNS enabled at the flag level plus the extension provides more predictable results, especially after updates.

4. What mode should I choose in an anti-detect browser?

If calls are unnecessary — "Disabled" or "Proxy only" with non-proxied UDP blocking. If calls are needed — "public interface only" plus mDNS and media permissions control.

5. How to know local IPs are not visible?

The ICE candidates line should not include familiar patterns like 192.168.x.x, 10.x.x.x, 172.16–31.x.x. Instead, mDNS identifiers might appear.

6. I have a mobile proxy, but the test still shows the real IP.

Check the extension and WebRTC policy. Most often, non-proxied UDP is enabled or the extension is inactive in this profile or in private mode.

7. What benefits does a mobile proxy provider like mobileproxy.space offer?

It provides a stable mobile IP with rotation and region selection capabilities. When paired with a properly configured WebRTC, you get a clean and predictable configuration without real IP leaks.

8. Is it necessary to perform a DNS leak test?

For understanding the system level, it’s useful; however, the browser WebRTC test is key for this guide. The DNS test does not replace the WebRTC check. Use the internal link DNS leak test for quick navigation to the details section.

9. What to do if everything breaks after a browser update?

Check the mDNS flags and extension policy, reinstall extensions if necessary, and repeat the tests. Keep exports of configurations handy.

10. Is it possible to completely eliminate any leak risks?

In practice, it’s about minimizing to zero for browser scenarios. Follow the protocol: extension, flags, checks after updates, and profile control. This provides a stable leak-free result.

Conclusion

You have completed the journey: learned what WebRTC leaks are and why they pose risks behind a proxy, mastered checking for leaks, closing them using native browser solutions, with extensions, and in anti-detect browsers, properly linked everything with a mobile proxy, and conducted final tests. Now you have a checklist, a set of ready solutions for common problems, and an understanding of how to maintain the configuration in working order after updates.

Next steps: apply the settings to all browsers and profiles you work with; automate the testing routine; if necessary, implement centralized policies within your organization. If you are using mobile proxies, such as mobileproxy.space, standardize rotation and result documentation so that any team member can reproduce the configuration accurately.

Areas for growth: explore the specifics of protecting against other context leaks (Canvas, AudioContext, WebGL), understand site isolation policies, cookie strategies, and fingerprint management. But the foundation — preventing the browser leak of your real IP through WebRTC — is already set and verified.

About the Author

Roman Melnikov

Roman Melnikov

Technical Writer and System Administrator

Work Experience: Technical writer and DevOps engineer with 9 years of experience. Created over 50 detailed guides on system configuration and administration. His instructions helped thousands of professionals successfully solve technical tasks. Popular author on Habr and YouTube.
Education: Bauman Moscow State Technical University. Information Systems and Technologies
Expertise:
Technical Documentation DevOps System Administration Linux Docker and Kubernetes CI/CD Infrastructure Automation Cloud Technologies System Monitoring Bash and Python Scripting

Share this article: