On this page
- A DNS filter sees only a server name, never what comes from it.
- In our tests the pure ad host was blocked, but the hosts carrying the video and its ads were the same.
- Patched apps and HTTPS decryption each carry terms or security risks.
- Feed ads in Facebook and Instagram have the same limit.
It is the most common question we get: "I installed an ad blocker, why do YouTube ads still play?" The honest answer is that this is a limit of the method, not a bug, and any tool that claims otherwise is either changing the app itself or reading your encrypted traffic.
How a DNS filter decides
A DNS filter sees one thing: the name of the server an app is about to contact. It never sees the video, the ad or the page. If a name is used only for ads, blocking it is safe. If a name is used for both content and ads, the filter has no safe choice, because blocking it breaks the content too.
What we saw when we tested
We tested a YouTube video on an Android 17 emulator with a DNS filter on. The pure ad host googleads.g.doubleclick.net was blocked, as expected. But the player's data host, youtubei.googleapis.com, and the video hosts under googlevideo.com carried both the video and the ad information. Blocking them stops YouTube from working, so a responsible filter has to let them through.
The two ways around it, and why we skip them
- A patched YouTube app. Removes ads in the client. It breaks YouTube's terms, cannot be updated through Google Play, and you are trusting whoever patched it with your account.
- Decrypting HTTPS traffic. The blocker installs a certificate so it can read and edit everything your phone sends. That is a real security risk and many apps refuse to work with it.
What you can do about YouTube ads
- YouTube Premium. It removes ads and adds background play, and it pays the creators you watch.
- Watch in a browser. On the YouTube website a browser with ad blocking can hide some ads. Results vary, and YouTube changes its page often, so it can stop working.
- Use a DNS blocker for everything else. It removes most banner and full-screen ads in games, news and tools, where it works well.
The same limit applies to social feeds
Sponsored posts in Facebook and Instagram feeds are part of the feed itself and arrive from the same servers as the posts. A name-based filter cannot tell them apart. This is true for every DNS ad blocker, including the paid ones.
How to judge any ad blocker's claims
- Ask whether it works at DNS, in the browser, or inside the app.
- Be wary of "blocks all ads" for apps that came from outside the developer's official site.
- Check what permissions it asks for, and whether it asks you to install a certificate.
Frequently asked questions
Can a DNS ad blocker block YouTube ads on Android?
Not reliably. YouTube serves the video and its ads from the same servers, so blocking them breaks playback.
Why do ads still show in Facebook and Instagram?
Sponsored posts arrive from the same servers as the feed, so a name-based filter cannot separate them.
How can I avoid YouTube ads legitimately?
Use YouTube Premium, or watch in a browser with ad blocking, accepting that results vary.
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