VPN Leak Test - Is your private IP public?

A VPN is often used to hide your IP address in order to surf anonymously on the Internet. However, a wrong configuration by the user or the VPN software can lead to a leak of the original IP address or other sensitive information. The EXPERTE.com VPN Leak Test checks if your VPN configuration leaks sensitive information.

The VPN Leak Test checks 3 categories:

Note: For the test to produce meaningful results, you must be connected to a VPN.

3 different tests

In the following we give you the technical details of the individual, potential VPN Leaks.

1.

DNS Leak

The Domain Name System (DNS) is responsible for resolving an Internet address like www.experte.com into the corresponding IP of the web server. Therefore, when you visit a website, your computer sends a query to a DNS server (name server), which responds with the appropriate IP address.

If your computer now sends the DNS queries to a DNS server that does not belong to the VPN provider, this DNS server will find out all the websites you have visited. Since the DNS protocol is also largely unencrypted, this data can also be monitored during transmission.

Our DNS Leak Check tests for you whether the DNS server you use belongs to your VPN provider. You can find more information on how it works on our DNS Leak Test page.

2.

WebRTC Leak

WebRTC is a protocol that enables communication between two computers. This allows video conferences or data transmissions to take place in the browser.

To connect to another computer, information about the IP addresses must be exchanged. In some browsers it is now possible to read the local and public IP of the user via JavaScript. A prepared website could thus find out your original IP address, even though you are connected to a VPN.

Our WebRTC Leak Check tests for you whether your browser leaks your IP address. You can find more information on our WebRTC Leak Test page.

3.

IPv6 Leak

IPv6 is a new Internet protocol that is expected to replace the currently used IPv4 in the future. However, many computers, networks and websites are already fully IPv6 capable. If you now want to visit a website that is only accessible via IPv6, your computer will use IPv6 to access it. If your VPN is configured for IPv4 only, your original IPv6 address will be visible.

Our IPv6 Leak Check tests if you can connect via IPv6 and if your original IPv6 address is leaked. You can find more information on our IPv6 Leak Test page.

Frequently asked questions

How can I prevent a VPN leak?

Use a reputable VPN provider and their VPN client. All VPN providers tested by us prevent a leak of your information.

"Possible DNS leak." What does that mean?

If you are connected to your VPN and receive the message "Possible DNS leak", check the list of DNS servers below the message. If one of the servers is your local DNS server or a public DNS server (e.g. from Google), you have a DNS leak.

"Possible WebRTC leak." What does that mean?

If you are connected to your VPN and receive the message "Possible WebRTC Leak", check the list of IP addresses below the message. If the WebRTC address is your original IP address, you have a WebRTC leak.

"Possible IPv6 leak" - What does that mean?

If you are connected to your VPN and receive the message "Possible IPv6 leak", check the list of IP addresses below the message. If the provider of your IPv6 address is your normal Internet provider, you have an IPv6 leak.

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