Ad blockers · DNS-level
AdGuard DNS & DNS-level ad blocking
There's a free way to cut ads and trackers across your whole device — phone, apps and all — without installing a single extension: blocking DNS. Here's how it works, what it genuinely does, where it falls short, and how AdGuard DNS compares to NextDNS and Pi-hole.
Last updated: July 10, 2026 · Researched by the Privacy Intact team (DNS services aren't part of our browser test harness, so this is research-attributed); see how we review.
How DNS blocking actually works
Every time your device loads a page or an app screen, it asks a DNS server to translate domain names (like ads.example.com) into addresses. A blocking DNS simply refuses to answer for known ad and tracker domains — so those requests never connect. Because every app uses DNS, this works device-wide: in your browser, and inside many other apps and games, not just one window.
The big advantages: it's free, it's light (no background app eating battery), and it covers the whole device with one setting. The catch is what it can't do.
What DNS blocking can't do
- Same-domain ads survive. If a site serves ads from the same domain as its content, DNS can't tell them apart. The classic example is YouTube — DNS won't clear its ads.
- No cosmetic cleanup. DNS stops the ad from loading but can't tidy the empty space it leaves; a browser blocker like uBlock Origin hides those gaps.
- It's domain-level, not page-level. Think of it as a broad net that catches a lot cheaply, with a browser or app blocker doing the fine work on top.
So the honest framing: a blocking DNS is an excellent base layer, not a complete ad blocker. Run it underneath a browser or system-wide blocker, not instead of one.
AdGuard DNS, NextDNS, or Pi-hole?
AdGuard DNS — easiest start, free
AdGuard DNS runs free public servers you can use with no account — just set them as your DNS on your phone, computer or router (check AdGuard's site for the current server addresses). A paid plan adds a personal dashboard: custom block lists, query statistics, per-device rules and parental controls. For most people the free servers are plenty; the paid tier is for those who want to tune and monitor it.
NextDNS — most customizable cloud option
NextDNS is the power-user's cloud DNS: a generous free monthly allowance, then a low flat price, with deep control over block lists, logging and analytics. Great if you want AdGuard-DNS-style convenience with more knobs.
Pi-hole — free, self-hosted, total control
Pi-hole is free and open-source, but you run it yourself on a device on your network (a Raspberry Pi is the classic choice). It blocks for every device in the house and gives you complete control — best for tinkerers comfortable maintaining a small server.
One safety note
Your DNS provider can see every domain your device asks for, so the provider's trustworthiness matters. Stick to reputable names with clear privacy policies — AdGuard DNS, NextDNS, Quad9 — and avoid random "free ad-blocking DNS" servers with no stated policy or funding. The convenience isn't worth handing your browsing history to an unknown operator.
FAQ
DNS ad-blocking, answered
What is AdGuard DNS, in plain terms?
It's a public DNS service that refuses to look up ad and tracker domains. You point your phone, computer or router at it, and ad/tracker requests fail to resolve before they ever load — across the whole device, in apps as well as the browser. AdGuard runs free public servers you can use with no account, plus a paid tier for custom rules and stats.
Is AdGuard DNS free?
Yes — AdGuard's default public DNS servers are free and need no signup; you just set them as your DNS. The paid AdGuard DNS plan adds a personal configuration (custom block lists, query stats, per-device rules, parental controls). Most people are well served by the free servers.
Does DNS blocking stop all ads (like YouTube's)?
No, and this is the key limit. DNS blocking works at the domain level, so it can't remove ads served from the same domain as the content (YouTube is the classic case), and it can't do in-page cosmetic cleanup — empty boxes may remain. It's a broad, lightweight base layer, not a replacement for a browser blocker or a system-wide app. Pair it with one.
AdGuard DNS vs NextDNS vs Pi-hole?
All three block ads at the DNS level. AdGuard DNS is the easiest start (free public servers, no setup account). NextDNS is the most customizable cloud option (generous free tier, then cheap). Pi-hole is free and powerful but you self-host it on a device like a Raspberry Pi — best for tinkerers who want full control over a home network.