How to Check for VPN IP Address Leaks

Connecting a VPN and seeing the status light turn green is not the same as knowing your real address stays hidden. An IP leak happens when some of your traffic, or some of the information a website can read, still carries the address your internet provider gave you instead of the address of the VPN exit. The good news is that you can check this yourself, with no special software, in about five minutes. The better news is that a few extra checks catch the problems that a single quick look misses.

This guide is a routine for learning how to test VPN IP leaks in a way you can repeat: what to write down first, which tests to run, how to read each result, and how to tell a real leak from a harmless false alarm. If you want the theory of why leaks happen, read what an IP leak is first; this article is the practical companion.

What an IP leak test actually measures

An IP leak test is nothing more than a web page that looks at the connection reaching it and tells you what it sees. The page reads the source address of your request. If the VPN is working, that source address belongs to the VPN exit. If part of your traffic travelled outside the tunnel, the page sees your normal address instead.

That simple idea has three consequences worth knowing before you start.

• The test only sees what reaches it. The page tests the browser connection you used to open it. It says nothing about your games, your mail app or a torrent client running in the background, which may take a different route.
• The test is a snapshot. It tells you what was true during the few seconds you ran it. A leak that appears only after the laptop wakes from sleep will not show up until you test at that moment.
• The test covers two address families. Most networks now carry both IPv4 (the older, shorter addresses) and IPv6 (the newer, longer ones). A tunnel can protect one and ignore the other. A good test page shows both lines, and you must read both. Protocol details are in RFC 791 for IPv4 and RFC 8200 for IPv6.

Think of the page as a mirror. It cannot fix anything, but it shows you the truth about the route your browser took.

Before you start: record your baseline

Most people skip this step and then cannot interpret the result. You need to know what "leaking" looks like on your own network before you can recognise it.

1. Turn the VPN off completely. Quit the app or switch the tunnel off, and wait ten seconds.
2. Open an IP-checking page in a normal browser window.
3. Write down every address it shows: the IPv4 address, the IPv6 address if there is one, and the internet provider or organisation name next to them. A screenshot works well.
4. Note the DNS line if the page has one. DNS is its own topic, covered in what a DNS leak is, but the baseline helps you compare later.
5. Note the network you are on. Home fibre, a mobile hotspot and hotel Wi-Fi all give different baselines, so record which one you tested.

You now hold a fingerprint of your unprotected connection. During the real test, none of those values should appear while the VPN is connected.

A small detail that saves confusion: if your home internet uses a shared address system, several households may appear behind one public address. That is normal, and it is the reason the organisation name on the page matters as much as the digits. If you see the same provider name as in your baseline, something is going around the tunnel.

Step by step: the five-minute test

Run these in order on one device, and do not change settings between steps.

1. Connect the VPN and wait until the app clearly says it is connected. A connection that is still negotiating can produce misleading results.
2. Open a fresh private or incognito window. This avoids cached pages and browser extensions from muddying the result. The private window has nothing to do with the VPN; it only keeps the test clean.
3. Load the IP-checking page and look at the IPv4 line. It must differ from your baseline, and the organisation name should be different too.
4. Look at the IPv6 line. It should show either the VPN exit's IPv6 address, or nothing at all because IPv6 is switched off or not offered. It must not show your baseline IPv6 address.
5. Refresh three times, waiting a few seconds each time. A stable result across refreshes is a good sign; an address that flips back to your baseline is a leak.
6. Open the page in a second browser if you have one. Browsers can handle IPv6 and proxies differently, so a clean result in one and a leak in another is useful information.
7. Run a browser fingerprint check such as the one at Cover Your Tracks if you want to see how identifiable your browser is even with the right address. That tool measures something different from an IP leak, but it reminds you that the address is only one signal.

If all lines are clean, you have passed the basic test. Do not stop there, because the more interesting failures happen when conditions change.

Reading the results: a quick table

Use this table to decide what each outcome means. "Baseline" is the address you wrote down earlier.

What the test page shows	Likely meaning	What to do
IPv4 differs from baseline, IPv6 empty	Normal and clean	Nothing, the tunnel covers what the page can see
IPv4 differs, IPv6 matches baseline	IPv6 leak: v6 traffic goes around the tunnel	Disable IPv6 on the device or in the app, or use a build that handles it; see IPv6 leaks
IPv4 matches baseline	VPN not carrying this traffic	Check the app is truly connected, then try another network
Two different VPN addresses on two refreshes	Often normal load sharing at the exit	Confirm both belong to the VPN, not your provider
Address differs but provider name is yours	Possible split or partial route	Check split tunneling and per-app rules
Page times out only when VPN is on	A connectivity problem, not a leak	See VPN connected but no internet

The provider name column is the one beginners overlook. Digits alone can mislead, because providers change ranges. The organisation label tells you who owns the address.

IPv6: the check people skip

Many leaks that people report are IPv6 leaks. The pattern is simple. Your home network gives your device both an IPv4 and an IPv6 address. The VPN tunnel is built for IPv4 only. When you open a site that offers IPv6, the system prefers IPv6, and that traffic leaves through the normal route, carrying your real IPv6 address.

How to test it cleanly:

• Use a test page that reports IPv4 and IPv6 on separate lines, or run two separate pages, one that works only over IPv4 and one only over IPv6.
• With the VPN on, the IPv6 line should be the VPN's or be blank. If it shows your provider's v6 address, you have a leak.
• If you cannot tell whether your network has IPv6 at all, check the baseline from earlier. An empty IPv6 baseline means the test cannot show a v6 leak on that network, but a hotel or mobile network you visit later may be different. Retest there.

If you find a leak, the usual fixes are turning off IPv6 on the network adapter, using an app setting that blocks or tunnels IPv6, or updating the app. Platform-specific details exist for Windows and in the general explainer on IPv4 versus IPv6 with a VPN.

Test under stress: switches, sleep and reconnects

A VPN that passes on a calm Tuesday can leak on a busy Friday. These scenarios are where real protection is decided, so test each one on purpose.

Switching networks. Connect the VPN on Wi-Fi, then turn Wi-Fi off and let the phone fall back to mobile data (or the reverse). Watch the test page during and after the switch. Many leaks happen in the gap while the tunnel rebuilds. Refresh the page every few seconds for the first thirty seconds.

Sleep and wake. Connect, confirm clean results, close the laptop lid for two minutes, then open it and check immediately. Do not wait for the app to reassure you; load the test page in the first few seconds. Some systems send traffic before the tunnel returns.

Dropping the connection. Briefly disconnect the Wi-Fi router's internet cable, or toggle airplane mode for ten seconds, then restore it. See whether the page shows your baseline during the recovery. A kill switch or similar protection is supposed to close this gap; how to test a kill switch shows a dedicated method.

A second app. While the VPN is on, open a different program that reports its public address, such as a command-line check or a different browser profile. If one app shows the baseline and another does not, the leak is app-specific, often a setting that makes that app bypass the tunnel.

Record the results of each scenario. A table with five rows and a tick or cross is enough, and it makes the next test faster.

Mistakes that create false alarms

Not every unexpected number is a leak. Rule these out before you panic.

• Testing before the connection is complete. Wait until the app shows connected, and then ten more seconds.
• Reading a cached page. A page loaded before you connected may still show the old address. Use a fresh private window, or force-refresh.
• Browser extensions. Some extensions change what a site sees. Test in a clean profile.
• Mixing devices. If you test on your phone but note the baseline from your laptop, the addresses will naturally differ. Always compare like with like.
• Confusing the exit address with a "wrong" country. Location databases are imperfect, so a page may place a VPN address in an unexpected city. That is a database quirk, not a leak; see why a VPN shows the wrong location.
• Forgetting dual addresses. Seeing both an IPv4 and an IPv6 value is normal. The question is whether either one is yours.
• Judging from one site. Use two different test pages and compare. Different pages occasionally disagree, and agreement between two is more convincing than one.

If a result survives all of these checks and your baseline address still appears, it is a real leak, and you should stop using that connection for anything sensitive until it is fixed.

What to do when you find a leak

Work through this order, because it goes from cheap to expensive.

1. Disconnect and reconnect, then test again. A glitch during the first connection is common.
2. Restart the device and test once more.
3. Update the VPN app and the operating system. Many leaks are fixed in updates.
4. Check the app settings for IPv6 handling, split tunneling and any "allow LAN" or bypass options.
5. Try another network such as mobile data. If the leak vanishes, the first network was interfering.
6. Switch the connection method inside the app if it offers several, and test again.
7. Contact the provider's support with your test details: the device, the network type, the baseline, what leaked and when. Concrete evidence gets faster answers.

With XPASS passes you connect through the free VPNclient app using the username and password on your My Pass page; the download page lists the official app links if you need to reinstall a current version before retesting.

Until the issue is solved, avoid sensitive work on that connection. A leak does not mean the VPN is useless, but it does mean the protection you assumed is incomplete.

How often to repeat the test

You do not need to test every day, but a few moments matter.

• After any update to the app or the operating system.
• After changing settings, especially anything involving IPv6, DNS or per-app rules.
• When you move to a new kind of network: your home fibre, a workplace, hotel Wi-Fi, a train, a mobile hotspot.
• Before a trip or an important task, such as handling client files.
• If something feels off: a site greets you in the wrong language, or an app complains about your location.

A simple habit is a thirty-second version: connect, open the test page, glance at both lines and the organisation name. Keep the longer stress version for when something has changed.

Summary

Testing for an IP leak means comparing what a test page sees with a baseline you recorded without the VPN. Check both IPv4 and IPv6, read the organisation name as well as the digits, and repeat the test while switching networks, waking from sleep and reconnecting, because that is when real leaks appear. A clean result proves only what the test could see, so combine it with sensible habits and the companion checks for DNS and WebRTC.

If you are choosing a VPN you can test this way at your own pace, the pricing page shows the prepaid passes available.