Every time you type a website address into your browser — like “google.com” or “amazon.com” — your computer doesn’t actually know where that website lives. It has to look it up first. That lookup is handled by something called DNS, or Domain Name System.

Think of DNS like the phone book of the Internet. Just like a phone book translates a person’s name into their phone number, DNS translates a website name into the numerical address your computer needs to actually connect to it. This happens automatically, every single time you visit a website, and it’s completely invisible to you.

Why Does DNS Matter for Your Family’s Safety?

Here’s the important part: by default, your Internet provider controls which DNS service your home uses. And most ISPs use a basic DNS service that does nothing to protect you — it will happily look up the address of a malware site or an adult website just as readily as it looks up Google.

But you can change that. There are free DNS services specifically designed to block dangerous and objectionable content before it ever reaches your devices. When a device on your network tries to visit a malicious or blocked site, the DNS service simply doesn’t return an address — so the connection never happens.

This is especially effective against certain types of malware, including ransomware, which needs to “phone home” to a criminal’s server to do its damage. Block that lookup, and the malware can’t function.

Free DNS Services Worth Using

Cloudflare for Families is a free service from Cloudflare, one of the most trusted names in Internet security. It comes in two flavors:

  • Block malware only: use 1.1.1.2 (primary) and 1.0.0.2 (secondary)
  • Block malware and adult content: use 1.1.1.3 (primary) and 1.0.0.3 (secondary)

More details are on Cloudflare’s website.

OpenDNS is a free service from Cisco that offers similar protection and additional customization options. Their DNS servers are 208.67.222.222 and 208.67.220.220. You can learn more at the OpenDNS website.

How Do You Change It?

The best place to make this change is on your home router, so every device on your network — phones, tablets, laptops, smart TVs — is automatically protected without you having to configure each one individually.

Every router is a little different, but the general steps are:

  1. Log into your router’s admin page (usually by typing 192.168.1.1 or 192.168.0.1 into your browser)
  2. Look for a section called “DNS”, “WAN Settings”, or “Internet Settings”
  3. Replace the existing DNS addresses with the ones above
  4. Save and restart your router

If you’re not sure how to do this for your specific router, search Google for “change DNS on [your router brand]” and you’ll find step-by-step instructions. Cloudflare also offers setup guides for most common routers and devices.

Bottom line: Changing your DNS takes about five minutes and costs nothing. It’s one of the single easiest things you can do to improve your family’s safety online.