postheadericon What is a DNS Leak & How Can You Prevent a DNS Leak?

Protect Yourself from DNS Leaks

Google DNS Leak

It’s no secret that FlashRouters are serious proponents of VPN usage: our official supported provider list certainly speaks to that.

In an age of massive amounts of online governmental snooping, identity theft, and hacking, protecting your wireless network is not just a luxury; it’s a necessity, and a VPN is a surefire way to keep all of your sensitive online information out of the wrong hands.

But even if you’ve gotten your VPN subscription all set up, it’s important to maintain vigilance. VPN services can let you down in a number of ways if you’re not careful, and there are some bigger issues that VPN users need to be aware of.

What is a DNS Leak?

It’s called a DNS leak, and it can most definitely happen to you.

DNS, or the Dynamic Name System, translates domain names into IP addresses, represented by a series of numbers. For example, one of Yahoo’s IP addresses is, and when you type in “” to your address bar and arrive at Yahoo, that’s because your ISP (Internet Service Provider), with the help of their DNS servers, have translated that domain name from that numerical IP address.

Ideally, when you’re using a VPN, it’s your VPN’s DNS servers translating these IP addresses into domain names, rather than your original ISP. But sometimes, Windows defaults to its original settings and translates those IP addresses through your ISP’s DNS servers, rather than your VPN.

That, my friends, is called a DNS leak, and if the government can snoop on your ISP’s servers, then they can now see what you’re doing online. And if it can happen to Google (as the picture up top references), it can happen to you. This is why it is important to learn how to prevent a DNS leak.

How Can I Detect or Prevent a DNS Leak?

Using a DNS Leak Test

DNS Leak Test

Detecting a DNS leak is the simple part. For that, we recommend going to

If your results show either your actual location or an IP address from your ISP, then you’ve got yourself a DNS leak.

Preventing a DNS leak altogether is a little trickier. It helps if you’re subscribed to a VPN with DNS leak protection, like PrivateInternetAccess, but that’s unfortunately not the most popular VPN feature these days.

HideMyAss actually has a number of ways to prevent a DNS leak over on their personal Wiki. Among their suggestions is blocking non-VPN traffic by using “IP Binding“, or you configure your firewall to do the same. Doing so “ensures that your real internet connection is not being used, and also that your ISPs DNS servers are not being used.”

Lastly, FlashRouters also recommends checking out VPN Check Pro, which both keeps you safe in the event that your VPN malfunctions and features a DNS leak fix. You’ll need to enable the feature on your own, but at least it’s there, and while this option costs a little, it is definitely cheaper than the alternative of allowing your credit card numbers to be exposed.

Want more information about online privacy and security? Follow us on Twitter and like us on Facebook.

The post What is a DNS Leak & How Can You Prevent a DNS Leak? appeared first on FlashRouters Blog.

FlashRouters BlogFlashRouters Blog

Comments are closed.