How to detect and prevent IP leaks: the complete 2026 guide

Most people assume that turning on a VPN or connecting to a proxy instantly hides their identity online. In reality, that is only part of the picture. Your browser, operating system, or network configuration can still reveal information that websites use to identify your real connection.

This is known as an IP leak.

An IP leak happens when your real IP address becomes visible even though you are using a VPN, proxy, or another privacy tool. A single leak can expose your location, link multiple accounts together, or reduce the effectiveness of your privacy setup.

One of the most common causes is a WebRTC leak. Modern browsers use WebRTC to support real-time communication features like voice and video calls.

The good news is that checking your setup takes only a few seconds. NodeMaven’s free Тест утечки WebRTC helps you see exactly what your browser exposes. It detects public IP addresses, local IP addresses, WebRTC behavior, and whether your browser is revealing information that websites can use to identify you.

Before scraping websites, managing multiple accounts, running automation tools, or simply browsing privately, it is worth spending a minute verifying that your browser is not leaking your real IP.

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What is an IP Leak?

An IP leak occurs when your device exposes an IP address that should remain hidden.

To understand why this happens, it helps to know the difference between the types of IP addresses your device uses.

Your public IP address is assigned by your internet service provider. Every website you visit sees this address unless you use a VPN or proxy.

Your private IP address is only used inside your home or office network. Normally, websites should never need access to it.

Why websites need your IP address

Whenever you visit a website, your browser sends requests to the server. Those requests include your IP address so the server knows where to send the response.

Websites also use IP addresses to:

• Estimate your location
• Deliver localized content
• Detect suspicious activity
• Prevent abuse
• Apply rate limits
• Identify repeated visitors

Seeing an IP address is completely normal. The problem starts when websites can see the wrong one.

Visible IP versus leaked IP

A visible IP is the address you intentionally present to websites.

Например:

• You connect through a residential proxy
• The website sees the proxy’s IP
• Your real home IP stays hidden

That is the expected behavior.

A leaked IP is different.

Suppose you connect through a VPN located in Germany. Everything appears correct at first. Then your browser sends a WebRTC request that exposes your real home IP in Austria.

The website now has two IP addresses:

Your VPN IP

Your actual ISP IP

That unexpected information is called an IP address leak.

A practical example

Imagine you manage several marketplace accounts.

Each account uses:

• A different browser profile
• A different proxy
• Different cookies

Everything appears isolated.

However, one browser profile leaks your real IP through WebRTC.

The platform now discovers that all accounts connect from the same home internet connection.

Instead of seeing separate users, it sees a single identity operating multiple accounts. That increases the chance of account restrictions or additional verification.

This is why running an IP leak test before using a new browser profile is an important habit.

Why IP leaks matter

An IP leak is more than a privacy issue. It can affect almost every activity that depends on accurate network identity.

Here are some common examples.

Конфиденциальность

Your public IP often reveals:

• Approximate location
• Internet provider
• Страна
• Город
• Connection type

Even if it does not identify you directly, it helps websites build a profile of your browsing activity.

Управление несколькими учётными записями

Many platforms compare IP addresses across accounts.

If multiple accounts unexpectedly share the same real IP, they may be linked together.

This is especially important for:

• eCommerce sellers
• Партнерские маркетологи
• Менеджеры социальных сетей
• Customer support teams

Веб-скрейпинг

Scrapers rely on rotating IPs to distribute requests.

If your browser leaks your real IP, websites may ignore the proxy and identify the original connection instead.

That can lead to:

• Faster blocking
• More CAPTCHAs (Learn how to bypass CAPTCHAs in our guide)
• Lower scraping success rates

Автоматизация

Автоматизация frameworks often use browser instances with different proxies.

If one browser leaks information through WebRTC, the automation environment becomes much easier to fingerprint.

Реклама

Advertising platforms monitor network consistency.

Suppose your account logs in from a proxy in London while WebRTC reports an IP from Spain.

That mismatch can trigger additional verification or fraud checks.

Социальные сети

Platforms such as Instagram, Facebook, LinkedIn, and X monitor unusual login patterns.

If your browser leaks an unexpected IP address, they may:

• Request identity verification
• Require two-factor authentication
• Temporarily restrict account activity

Fraud detection

Modern detection systems combine dozens of signals.

They compare:

• Отпечаток браузера
• Печенье
• Device information
• Часовой пояс
• IP-адрес
• WebRTC data

Even one inconsistent signal can reduce the trust score assigned to your session.

Common types of IP leaks

Not every leak happens for the same reason. Some originate in your browser. Others come from network settings or VPN configuration.

Understanding the differences makes it much easier to identify the problem.

1.     WebRTC Leak

A WebRTC leak is one of the most common browser leaks today.

WebRTC stands for Web Real-Time Communication. It is a browser technology that allows websites to support features like video calls, live streaming etc.

To establish these direct connections, browsers communicate using STUN servers. A STUN server helps your browser discover which IP addresses are available for communication.

Normally, this process happens behind the scenes.

The problem is that some websites can access this information through JavaScript.

As a result, they may discover:

• Your public IP
• Your private IP
• Additional network information

For users who rely on proxies or VPNs, this completely defeats the purpose of hiding their identity.

How to check for a WebRTC leak

The easiest method is to use NodeMaven’s free WebRTC leak test before starting any browsing session.

The test runs directly in your browser and completes in just a few seconds.

It checks information such as:

• Public IP detected through WebRTC
• Local or private IP exposure
• Browser WebRTC behavior
• Whether the detected IP matches your proxy or VPN
• Browser information that websites can access through WebRTC

If the reported IP matches your proxy or VPN, your configuration is working correctly.

Running this test whenever you create a new browser profile, switch proxies, connect to a different VPN, update your browser, or launch a new automation environment can save hours of troubleshooting later.

2.     DNS Leak

Not every IP leak comes from WebRTC. Sometimes your browser sends DNS requests outside the secure tunnel created by your VPN or proxy.

The Domain Name System (DNS) translates human-readable domain names into IP addresses. For example, when you visit example.com, your device first asks a DNS server which IP address belongs to that domain.

Ideally, those DNS requests should travel through the same VPN or proxy connection as the rest of your traffic. If they don’t, you have a DNS leak.

How to check for a DNS leak

The easiest way to verify your configuration is to run NodeMaven’s free DNS leak test.

The browser-based tool completes in seconds and shows exactly which DNS resolvers are answering your requests. You can run either a standard 6-query test for a quick privacy check or an extended 18-query test for a more detailed analysis.

The results include:

• DNS resolver IP addresses
• Resolver provider
• АСН
• Страна
• Resolver type

3.     IPv6 Leak

Most internet traffic still uses IPv4, but IPv6 adoption continues to grow worldwide. Many internet providers now assign both types of addresses to the same connection.

This creates a problem if your VPN or proxy only routes IPv4 traffic.

Your IPv4 address may be hidden correctly while your IPv6 address remains exposed.

IPv4 vs IPv6

Although only one address leaked, your real location is no longer hidden.

This is why many professionals disable IPv6 if their VPN or proxy does not support it correctly.

4.     Proxy or VPN misconfiguration

Not every proxy IP leak is caused by browser technologies. Sometimes the setup itself is incorrect.

Here are the most common configuration mistakes.

Split tunneling

Split tunneling allows certain applications to bypass the VPN. While useful in some situations, it can accidentally expose your real IP.

Browser extension only

Many users install only a proxy extension.

The extension routes browser traffic but not every browser feature.

Some requests may still bypass the extension. For sensitive work, use system-wide proxy settings or software designed for complete traffic routing.

Disconnected proxy

Sometimes a proxy disconnects without the browser clearly notifying the user. Traffic immediately falls back to the local internet connection.

Without regular testing, you may continue browsing with your real IP for several minutes before noticing.

Incorrect proxy configuration

A small mistake can expose your real connection.

Common examples include:

• Wrong proxy protocol
• Incorrect authentication
• Unsupported browser settings
• Applications bypassing the configured proxy
• Outdated browser profiles

This is one reason experienced users verify every new setup before using it for important tasks.

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How to Test for an IP Leak

Testing your browser takes less than one minute.

It is much easier to discover a problem before logging into important accounts than after they have already been linked.

Follow these four steps.

Step 1. Find your real IP

Before enabling any privacy tools, note your actual public IP address. This gives you a reference point.

Later, you can compare it with the IP your browser exposes.

If the same address appears after connecting to a VPN or proxy, something is wrong.

Step 2. Enable your VPN or proxy

Connect using your preferred setup.

This could be:

• A резидентский прокси
• A мобильный прокси
• Ан ISP прокси
• A VPN
• An anti-detect browser with a configured proxy

Wait until the connection is fully established before testing.

Step 3. Run NodeMaven’s free WebRTC leak test

This is the most important step.

NodeMaven’s free Тест утечки WebRTC checks whether your browser exposes information through WebRTC that websites can access.

Unlike a basic IP checker, it focuses on one of the most common causes of browser identity leaks.

One of the biggest advantages of NodeMaven’s tool is its simplicity. The test runs directly in your browser and usually finishes in just a few seconds.

Step 4. Verify DNS and IPv6

WebRTC is only one possible leak.

You should also confirm that:

• DNS requests are routed correctly
• IPv6 traffic is protected
• Your browser reports the expected location
• No additional IP addresses appear

Together, these checks provide a much more complete picture of your privacy setup.

What a good IP leak test looks like

How to prevent IP leaks

There is no single setting that prevents every type of leak. Instead, combine several good practices.

Use high-quality residential proxies

Reliable residential proxies are less likely to introduce routing problems and are trusted by more websites.

Configure your VPN correctly

Check that your VPN:

• Routes all traffic
• Protects DNS requests
• Supports IPv6 or disables it safely
• Reconnects automatically after interruptions

A secure VPN configuration reduces the chance of unexpected traffic escaping outside the encrypted tunnel.

Manage WebRTC carefully

WebRTC is useful for many web applications. Disabling it entirely is not always practical.

Вместо:

• Use browsers with good privacy controls
• Review browser settings
• Verify behavior after updates
• Run regular WebRTC tests

Configure DNS correctly

Use trusted DNS servers supplied by your VPN or another secure provider.

Incorrect DNS routing can expose browsing activity even when your IP address appears protected.

Review IPv6 settings

If your VPN or proxy fully supports IPv6, keep it enabled.

If it does not, disabling IPv6 may provide better protection until proper support is available.

Тестируй регулярно

This is the simplest recommendation and often the most overlooked.

Testing takes less than a minute.

Fixing an account ban or rebuilding a scraping environment can take days.

Why you should test before every session

Many users test their setup once and never check again. Unfortunately, browser behavior changes over time. A configuration that worked perfectly last month may leak information today.

Общие причины включают:

• Browser updates
• New browser extensions
• Proxy changes
• Operating system updates
• Automation framework updates
• Modified browser profiles

Running NodeMaven’s free WebRTC leak test before an important session takes less than one minute.

That small investment can prevent account bans, failed scraping jobs, unnecessary CAPTCHAs, and hours of troubleshooting.

Don’t rely on free proxies that may expose your real IP. Get started with NodeMaven for $3.50 and receive 750 MB of residential and mobile proxy traffic

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Заключение

Understanding what is an IP leak helps you protect your online identity. Even trusted VPNs, proxies, and anti-detect browsers can leak your real IP through WebRTC, DNS, IPv6, or configuration errors.

Before scraping, managing accounts, or browsing privately, run free WebRTC leak test.

It takes just seconds to verify that your browser isn’t exposing your real IP and that your proxy or VPN is working correctly.

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