Pi-hole Explained: Block Ads on Every Device on Your Home Network

Browser ad blockers are great, but they only work on the browser they are installed in. They do nothing for the ads inside apps on your phone, the trackers built into your smart TV, or the data your fridge is quietly sending home. Pi-hole solves all of that in one place. It is a small piece of software that runs on a cheap computer at home and blocks ads at the network level, before they even reach your devices.

If that sounds intimidating, it is not. The whole setup takes about an hour and the hardware costs around $40. Here is what it actually is and how to get it running.

What Pi-hole Actually Does

When your phone loads a webpage or opens an app, it asks a DNS server to translate names like ads.example.com into IP addresses. Pi-hole acts as your home's DNS server. When something on your network asks for a known ad or tracker domain, Pi-hole simply refuses to answer. The ad never loads because the device never finds the server it was supposed to talk to.

The benefits add up fast.

• Ads disappear in apps, smart TVs, game consoles, and devices that cannot run extensions.
• Pages load faster because you are not downloading ad scripts.
• Your monthly data use drops, which matters on metered connections.
• Trackers from companies you have never heard of stop seeing your activity.
• You get a dashboard that shows exactly what every device on your network is asking for, which is eye opening the first time.

If you want to understand DNS itself before going further, our guide on how DNS works covers the basics in plain language.

What You Need

Pi-hole is most often run on a Raspberry Pi, which is where the name comes from. But it runs on almost anything that can run Linux or Docker.

• Easiest: Raspberry Pi 4 or Raspberry Pi 5 with a power supply, a microSD card, and a case. About $60 to $80 total.
• Cheapest: Raspberry Pi Zero 2 W. About $20.
• Existing hardware: An old laptop, a NAS that supports Docker, or a home server you already run.

You also need an ethernet cable to plug it into your router. WiFi works but ethernet is more reliable, and you really want your DNS server to be reliable.

Step by Step Setup

1. Install the Operating System

Download the Raspberry Pi Imager from the official Raspberry Pi site. Plug your microSD card into your computer, open the Imager, and choose Raspberry Pi OS Lite (64 bit). The Lite version has no desktop, which is what you want for a server. Click the gear icon to set a hostname, enable SSH, and create a username and password before you write the card.

2. Boot the Pi

Put the card in the Pi, plug in ethernet, and plug in power. Give it two minutes to boot. From your laptop, open a terminal and connect with SSH using the hostname and password you set.

3. Install Pi-hole

Run this single command:

curl -sSL https://install.pi-hole.net | bash

The installer asks a series of questions. Accept the defaults for most of them. When it asks which upstream DNS provider to use, Cloudflare or Quad9 are good choices. Both respect privacy and are fast. When it finishes, write down the admin password it gives you and the Pi's IP address.

4. Tell Your Router to Use Pi-hole

This is the only step that takes a little router work. Log in to your router's admin page. If you do not know the address, our guide on finding your router IP covers it. Find the DHCP or LAN settings, look for DNS server, and enter the Pi's IP address. Save the change.

Now restart the WiFi on a single device, like your phone, to confirm everything still works. Open the Pi-hole admin page in a browser at the Pi's IP and watch the queries roll in. You should see your phone showing up immediately.

If anything breaks, just remove the DNS entry from your router and you are back to normal. Pi-hole only affects DNS, so backing it out is one click.

What to Expect After a Day

The first 24 hours are the most fun. Open the dashboard and watch your devices light up. You will likely see:

• Smart TVs phoning home thousands of times per day
• Apps you forgot you installed checking in
• Devices asking for telemetry servers you have never heard of
• About 5 to 15 percent of all queries getting blocked

Most people do not notice ads disappearing because the brain quickly stops registering them. But you will notice pages feeling snappier, especially on news sites and free mobile games.

Things That Sometimes Break

Pi-hole is well behaved but a few quirks come up often.

• Some sites need their tracking allowed to work. Banking sites and shopping sites occasionally use ad domains for fraud detection. The dashboard makes it easy to whitelist a specific domain in two clicks.
• Apps that bypass DNS. Some apps (looking at you, certain smart TV apps) hard code Google's DNS into themselves and ignore your network setting. You can fix this by blocking outbound DNS at the router and forcing everything through Pi-hole.
• YouTube ads. YouTube serves ads from the same domains that serve videos, so Pi-hole cannot block them at the DNS level. You still need a browser extension or YouTube Premium for that.

Should You Bother?

If you have a few smart devices, kids on tablets, or you just want to know what is happening on your network, Pi-hole is one of the best home network upgrades you can do. The hardware is cheap, the setup is a one time job, and the privacy gain is real. The dashboard alone is worth it the first week.