Why should you always run a WebRTC leak test before using a static IP?

When preparing to use a static IP, the first step most people take is to look up their public IP, checking whether the country, city, carrier, and IP type match their expectations.

However, a single regular IP check result cannot fully reveal the browser's current network status. Especially when using a fixed network environment for a long time, the browser's own network communication method is also worth inspecting, and one easily overlooked item is WebRTC leak detection.

Before officially using a new static IP, you can run static IP detection, IP leak detection, and WebRTC leak test together. This way, you will get a more complete set of information about your network environment.

1. Why Check WebRTC Even If Regular IP Detection Is Normal?

After opening an IP lookup website, the page shows that your current public IP is A. This means your web requests are presenting address A to the outside world, but browsers handle far more than just HTTP and HTTPS requests.

WebRTC is a browser technology built for real-time audio, video, and data communication. When a webpage establishes a real-time connection, it needs to find a suitable network transmission path. To do this, WebRTC performs ICE Candidate collection, which may gather different types of network address information.

As a result, regular web requests may return one set of results, while WebRTC collected information can show a completely different set.

A mismatch between these two results does not necessarily mean there is a problem. Browser version, system settings, network interfaces, IPv4/IPv6 configuration, and the browser's native privacy policy can all affect the final detection output.

The real thing to pay attention to is whether the WebRTC detection results align with your actual current network environment.

2. What Exactly Is WebRTC Leak Detection?

The term "WebRTC leak" is often misleading. It does not mean that the appearance of any address on a WebRTC test page automatically indicates an abnormal browser state.

When WebRTC sets up a real-time communication session, it inherently needs to access information related to network connections. Different types of ICE Candidates correspond to different network paths, such as host, srflx, and relay.

Modern browsers have also implemented a lot of privacy protections to prevent local network address exposure. For example, many browsers now use mDNS hostnames instead of directly displaying raw local IP addresses.

What you should actually look for in a WebRTC leak test are the address types in the results, whether any unexpected public addresses appear, and the correspondence between these public addresses.

If you end the test immediately after seeing a simple "Normal" or "Abnormal" prompt, you are not making full use of all the information the detection tool provides.

3. Why Run WebRTC Leak Detection Before Using a Static IP?

The defining feature of a static IP is its relative permanence. Since the address does not change frequently, most users will first check basic details like IP geolocation, carrier, ASN, network type, and IPv4/IPv6 status before official use.

But when the browser is actually running, it may interact with other network interfaces. In this scenario, you should not simply conclude that "B is the leaked IP". Instead, you need to verify the following points:

•  Which network interface is the browser currently using?

•  Are both IPv4 and IPv6 active at the same time?

•  Are there any other active network connections on the system?

•  What processing method does the current browser version use for WebRTC?

•  What type of ICE Candidate does the detected address belong to?

•  Do regular web requests and WebRTC detection go through different network paths?

Only by combining all this information can you accurately judge the actual state of your network environment. For this reason, WebRTC detection is better understood as a comprehensive network environment inspection tool, rather than a simple "pass/fail" test.

4. What Is the Difference Between IP Detection and WebRTC Leak Detection?

These two detection items are often discussed together, but their actual focuses are completely different.

IP detection shows "what public IP is displayed to the outside world"; WebRTC detection shows "what network address information the browser collects through its real-time communication mechanism". The two tests do not duplicate each other.

5. Follow This Inspection Workflow When Using a Static IP for the First Time

If you do not want to dive deep into WebRTC principles, you only need to follow this simple step-by-step workflow.

•  Run a regular IP detection first, and record the public IPv4, IPv6, location, carrier, and IP type.

•  Then run IP leak detection to check for any other significantly different public addresses.

•  Next, open the WebRTC leak detection tool to view the ICE Candidates and all public addresses listed in the results.

•  Finally, simply record the detection time, browser version, static IP address, and key test results.

Later, when you change your static IP, switch browsers, upgrade your system, or modify network configurations, you can run the test again and compare the new results with your previous records, so you do not have to guess what changed from scratch.

6. When Should You Re-run WebRTC Detection?

You do not need to repeat WebRTC detection every day. It is usually enough to re-check once when there is a noticeable change in your network environment. For example, you can run a new test right after switching to a new static IP.

You should also re-run the test after changing browsers, since different browsers handle WebRTC in different ways. It is also recommended to re-inspect after replacing your computer, operating system, or router, or modifying IPv4/IPv6 related settings.

In addition, if everything used to work normally but you suddenly notice the browser's network behavior is different from before, you can run a new WebRTC test. In other words, your first test mainly establishes a baseline, while subsequent tests make it easy to compare changes over time.

Final Summary

If you are preparing to use a new static IP, you can first run a public IP detection, followed by IP leak detection and WebRTC leak test, and save the results as the baseline of your current network environment.

When you change browsers, devices, systems, or network configurations later, re-run the tests. This will give you an intuitive view of whether any changes have occurred in your browser's network environment.

Regular IP detection checks your current public IP, IP leak detection verifies whether any other public addresses appear, and WebRTC detection further observes the network address information collected by the browser through WebRTC.