Short answer
DNS is the internet's phone book. When your child opens TikTok or a website, their device first asks "where is tiktok.com?" A DNS filter like Sheepdog Filter answers that question, and for anything you've blocked, it answers "nowhere". The app or page just doesn't load. It works on every device, needs no app, and can't slow the internet down.
The phone book idea
Every website and app lives at a numbered address on the internet. Phones and laptops don't remember those numbers. Instead, before anything loads, the device asks a DNS server (short for Domain Name System) to look the name up, a bit like looking someone up in a phone book.
Normally your internet company runs that phone book and answers every question. With DNS filtering, you swap in a phone book that knows which names are adult sites, gambling, scams, or apps you've switched off. Ask it for one of those and it gives no answer, so nothing loads.
Why parents like it
- It covers everything at once. Set it on your home Wi‑Fi router and every phone, tablet, TV, console and laptop in the house is covered, including friends' phones on your Wi‑Fi.
- No app on your child's phone. Nothing to install, update or have deleted. It's one setting.
- It works inside apps, not just browsers. Apps look up names too, so blocking "roblox.com" stops the Roblox app, not just the website.
- It doesn't read anything. A DNS filter only sees the name of the site (like "youtube.com"), never the pages, messages or passwords.
- It doesn't slow the internet down. A lookup takes a few thousandths of a second, and a good filter answers as fast as your internet company does.
What it can't do
Honest limits matter, so here they are:
- It can't block part of an app. DNS sees "youtube.com", not which video. It can block YouTube, or switch on YouTube's Restricted Mode, but it can't block only Shorts. The same goes for Snapchat's My AI or Instagram DMs.
- It can't read messages or screenshots. If you need to see who your child is talking to, that's a different kind of tool, and a much more invasive one.
- It only works where it's set up. Set it on the router and it covers your home Wi‑Fi. Set it on the phone too and it also works on mobile data and at friends' houses. See how kids get around parental controls.
How Sheepdog Filter uses it
Sheepdog Filter is a DNS filter built for parents rather than network engineers. You get one switch per worry (social media, games, adult sites, gambling, ads and more), a bedtime that turns the internet off at night, and a plain-English email each week. Under the hood it uses large, hourly-updated blocklists, forces SafeSearch on Google, Bing and DuckDuckGo, and blocks the VPNs and proxy sites kids use to get around filters.
Setup is a single address you paste into a device or router. Start with setting up Sheepdog Filter in five minutes.
Sheepdog Filter
The internet, childproofed in five minutes.
One switch per worry, every device in the house, and a plain-English report each week. Free to start, no app to install.
Start freeQuestions parents ask
Does DNS filtering slow down the internet?
No. A DNS lookup happens once per site and takes a few milliseconds. Sheepdog Filter runs on Cloudflare's global network, so lookups are usually as fast as, or faster than, your internet company's.
Can DNS filtering see my child's messages?
No. It only sees the name of the site or app being looked up, like "snapchat.com". It never sees pages, messages, photos or passwords.
Is DNS filtering the same as a VPN?
No. A VPN sends all of your internet traffic somewhere else. DNS filtering only answers the address lookups, and the rest of your traffic goes straight to the internet as normal.