Build a network-wide ad blocker with Pi-hole

Pi-hole is still one of the best Raspberry Pi projects because the payoff is immediate.

You install it once, point devices or your router at it for DNS, and suddenly a lot of ads, trackers, and junk domains stop resolving across your network. Phones, tablets, laptops, smart TVs, and random smart-home devices all benefit without you installing separate browser extensions everywhere.

That is the good part.

The honest part is that Pi-hole is not magic. It does not remove every ad in existence, it does not replace normal browser privacy tools, and it can absolutely break an app or service until you tune it.

If you approach it like a practical network tool instead of a miracle box, it is excellent.

If you already know you want a more hands-on Docker walkthrough, I also have an older companion setup article here: Setting Up Pi-hole for Network-Wide Ad Blocking. This page is the main overview and rollout guide; that one is the more literal install path.

What Pi-hole actually does

Pi-hole works at the DNS layer.

When a device on your network asks, "What IP address belongs to this ad or tracking domain?" Pi-hole can answer in a way that blocks that request instead of letting the connection happen normally.

That means it can stop a lot of unwanted third-party domains before content fully loads.

This is why Pi-hole is great for:

• many browser ads
• a lot of tracking and telemetry calls
• some in-app ads
• network-level visibility into what devices are trying to contact

It is less effective for:

• YouTube ads and similar tightly integrated ad systems
• services that serve ads from the same domains as the main content
• apps and devices using DNS-over-HTTPS or other methods that bypass your DNS settings

So the right expectation is not "the internet will now be perfectly clean forever."

The right expectation is "my network will be quieter, less annoying, and easier to understand."

Why this is such a good first Raspberry Pi project

Pi-hole is a strong first project because it checks a lot of boxes at once.

It is:

• genuinely useful
• cheap to run
• light on hardware requirements
• a good intro to DNS and local networking
• easy to maintain if you stay conservative

It also teaches a very good home-lab lesson early: a lot of tech wins come from small infrastructure choices, not flashy hardware.

Hardware I would actually use

Pi-hole does not need an expensive Raspberry Pi.

A practical setup looks like this:

• Raspberry Pi 3, 4, or Zero 2 W
• official or otherwise trustworthy power supply
• microSD card to start, or SSD if you already use one
• ethernet if possible
• simple case

You do not need a Pi 5 for this.

In fact, using an overpowered board for Pi-hole alone is usually wasteful unless the Pi also runs a couple of other light services and you know what you are doing.

Before you install anything, make these decisions

This is where people save themselves a lot of pain.

1. Will Pi-hole get a stable IP address?

It needs one.

Use either:

• a DHCP reservation in your router, or
• a static IP on the Pi

I prefer a DHCP reservation when the router supports it cleanly. It keeps the network easier to reason about.

2. Will you test on one device first or move the whole house immediately?

If you live alone and enjoy fixing things, whole-network rollout is fine.

If other people depend on the network and hate surprises, test first on:

• your phone
• your laptop
• one TV or tablet

That is the calmer approach.

3. What upstream DNS provider do you want?

Pi-hole filters DNS, but it still forwards allowed queries upstream unless you pair it with something else.

Common choices include:

• Cloudflare
• Quad9
• Google Public DNS
• running Unbound locally later if you want more control

There is no need to turn this into a philosophical identity crisis on day one. Pick a reputable provider and move on.

4. Is your router good enough?

Some routers make DNS configuration simple.

Some ISP routers behave like they were designed by people who dislike networking and the people who do it.

If your router has limited DNS settings, you may need to test Pi-hole device by device first.

The setup flow I would follow

Pi-hole's documentation still supports a simple automated install path, and for most home users that is the right place to start.

Step 1: Prepare the Pi

Install Raspberry Pi OS, boot it, and update it.

Keep the base system boring and clean. This is not the moment to install ten unrelated services.

Step 2: Give the Pi a dependable network identity

Before Pi-hole goes on the box, make sure the device will keep the same IP address.

This matters because DNS clients need a stable server address.

Step 3: Install Pi-hole

Use the current official Pi-hole documentation rather than a random old forum post or a copied command block from five years ago.

The install itself is usually straightforward.

During setup you will typically choose:

• network interface
• upstream DNS provider
• blocklists
• whether to install the web admin interface
• logging preferences

For almost everyone, the web interface is worth having.

Step 4: Log in to the Pi-hole admin dashboard

Make sure you can reach the web UI and see queries coming in once a device starts using Pi-hole.

Step 5: Test with one device first

Instead of flipping your whole router immediately, point one phone or laptop at the Pi-hole box for DNS and browse normally for a while.

Check:

• common websites
• streaming apps you care about
• mobile apps that usually act fragile
• smart-home or TV apps if those matter in your house

This step catches most surprises without turning you into household IT support at the worst possible time.

Step 6: Move the network over if testing looks good

The cleanest whole-home setup is usually changing the router's DNS settings so clients receive Pi-hole automatically.

If your router cannot do that properly, you can still use Pi-hole on selected devices.

The three rollout strategies that make sense

Option 1: Per-device DNS

Best for:

• testing
• renters stuck with awkward router access
• cautious rollouts

Upside: low risk.

Downside: annoying at scale.

Option 2: Router-level DNS for the whole network

Best for:

• stable home setups
• people who want the biggest practical benefit
• households where you can control the router

Upside: clean and automatic.

Downside: if something breaks, a lot of things may break at once.

Option 3: Advanced setups with multiple DNS servers or redundancy

Best for:

• people who already understand what they are doing
• larger or more serious home labs

This can make sense later, but I would not start here unless redundancy is already a normal part of your setup.

My advice on blocklists: start boring

This is the part a lot of guides get wrong.

They treat giant aggressive blocklists like a badge of honor.

In reality, overblocking is the fastest way to make Pi-hole annoying.

Start with the default or another conservative baseline. Live with it. Add more only when:

• you know what problem you are trying to solve
• you can tell whether a new list improves anything
• you are willing to whitelist breaks calmly

More blocking is not automatically better.

Better blocking is better.

The real-world breakages you should expect

Some apps or smart TVs will act weird

This is normal.

Sometimes an app loads blank areas. Sometimes a sign-in flow hangs. Sometimes a TV app feels half-broken because it depends on blocked tracking domains in ways that should annoy everyone.

A family member will say "the Wi-Fi is broken"

They often mean one service is broken, not the whole network.

That is still your problem if you changed DNS for everyone.

Devices with hardcoded or encrypted DNS may bypass Pi-hole

This is becoming more common.

Pi-hole is powerful, but it does not control every device equally.

Your router may fight you

Some routers push their own DNS settings back onto clients or offer limited configuration.

If that happens, the project is not impossible, just more irritating.

The maintenance that actually matters

Pi-hole is not a high-maintenance project, but it is not a zero-maintenance project either.

The basics:

• keep the Pi updated
• update Pi-hole on a sensible cadence
• review query logs when something breaks
• keep backups of any custom lists and whitelists
• know how to disable blocking temporarily if you need to troubleshoot

Do not obsess over the dashboard all day. It is a tool, not a lifestyle.

Good upgrades after the basic install is stable

Once the simple version works, a few add-ons are genuinely useful.

Unbound

If you want your own recursive DNS resolver instead of forwarding to a third-party upstream service, Unbound is a popular next step.

Good upgrade, but not required for Pi-hole to be worthwhile.

Conditional forwarding

This can give you nicer local device names in the dashboard, which makes troubleshooting easier.

Groups and client-specific policies

Useful if you want stricter filtering on some devices than others.

A second Pi-hole instance

If you start relying on Pi-hole heavily, redundancy becomes attractive. That said, this is firmly "nice to have" for most homes, not day-one material.

When Pi-hole is not the right project

Pi-hole is excellent, but it is not for everyone.

Skip it or postpone it if:

• you cannot change router or device DNS settings
• your household will revolt over even brief app breakage
• you want every ad blocked with zero tuning and zero exceptions
• you do not want to do even a small amount of maintenance
• you are already overwhelmed by basic home-network concepts

There is no shame in deciding this one is for later.

What I would build today

If I were setting up Pi-hole from scratch right now, I would keep it simple:

• Raspberry Pi on ethernet
• stable DHCP reservation
• official install path from current docs
• conservative blocklists
• web dashboard enabled
• one-device testing first
• router-wide rollout only after normal daily stuff works

That gets you most of the benefit without making your network fragile.

The best mindset for Pi-hole

Think of Pi-hole as a small infrastructure upgrade, not a toy.

That mindset helps with every decision:

• reliability over cleverness
• stable IP over temporary hacks
• cautious rollout over dramatic whole-house changes
• conservative filtering over giant blocklists you do not understand

Do that, and Pi-hole is one of the rare Raspberry Pi projects that can move from "weekend experiment" to "useful box I barely have to think about."

And those are usually the best projects to keep.