When you’re online, here’s what you need to know about DNS hijacking

Q: What exactly is DNS hijacking, and how do I avoid it?

Malicious actors on the internet have spent countless hours testing various ways to compromise users, and the use of DNS hijacking is among the favored exploits.

DNS stands for domain name service, and it’s like an online traffic cop that we use every day to get to websites.

All websites are assigned an internet protocol, or IP, address, which is a series of numbers. For example, one of Amazon’s IP addresses is, which you can manually type into your browser to get to when it’s active.

To make things much easier for humans, names are assigned to those IP addresses so we don’t have to remember a bunch of random strings of numbers. We can simply type “Amazon.com” into our browsers and a DNS server will translate that to the proper IP address in the background.

In most cases, your DNS server is connected to your internet service provider, but you can change it and, unfortunately, so can the bad guys.

DNS hijacking

Hackers know that if they can modify or “hijack” your DNS settings, they can ultimately control where you actually get to go on the internet.

In the Amazon example, they can create elaborate fake versions of the website that hijacked victims are sent to when they type “Amazon.com.” They know that this exploit dramatically increases their chances of compromising unwitting victims.

What gets hijacked?

The most likely way you could become a victim of DNS hijacking is through malware designed to modify the DNS settings on your computer or router, which then silently points you to a rogue DNS server as your traffic cop.

It’s also possible that a hacked website can have its DNS addresses changed so that legitimate visitors are sent to malicious websites instead of the real thing.

Another ploy is to connect to public Wi-Fi networks and pose as a free connection so they can intercept requests and send users to rogue websites.

Protection tips

Since malware infections are the most common way you’ll become a victim, all of the usual advice applies: use updated security software, install security patches and updates as they’re made available, and avoid clicking on links in email, social media or even on websites that you’re not familiar with.

To protect your router from being compromised, make sure you change the default admin username and password for the device — every hacker on the planet knows the factory defaults.

You can’t do anything about a website you’re trying to visit that’s been hijacked, so be very cautious and suspicious when strange items pop up at a site you visit regularly.

Avoid using public Wi-Fi to access anything online that requires usernames and passwords, and if a public Wi-Fi connection allows you to connect without a “terms of service” page, be very suspicious.

Alternative DNS services

Changing your DNS settings yourself to an alternative service has many potential benefits, including speed and security. I’m a big fan of the free controls offered by OpenDNS, especially if you want global parental controls in your house.

Ken Colburn is founder and CEO of Data Doctors Computer Services. Ask any tech question on Facebook or Twitter.

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