Block ads for every device on your network with a single, lightweight DNS server.

TL;DR

Pi-hole intercepts DNS queries at the network level, blocking ads and trackers before they reach any device on your network. One Linux box (Raspberry Pi or otherwise) replaces per-device extensions; typical home networks see 15–30% of DNS queries blocked. Setup takes 20 minutes; the hard part is curating your blocklists.

Why DNS-level blocking matters

Ads don’t arrive as a single request. A page loads, your browser asks your router “where is ad-server-123.com?”, the router asks your ISP’s DNS, and the ISP’s DNS says “here’s the IP”. By the time your browser knows the address, the ad is already on its way.

Pi-hole sits between your devices and the internet’s DNS layer. When your phone asks “where is ad-server-123.com?”, Pi-hole answers: “nowhere—I’m blocking that”. The request dies before it leaves your network. Your phone gets nothing to load. Your smart TV, your laptop, your guest’s phone—all protected, no software installed on any of them.

This is different from browser extensions. Extensions run on one device, one browser. Pi-hole runs on one box and protects everything behind your router.

How it works: the Gravity engine

Pi-hole’s real power is its blocklist system, called Gravity. You feed it lists of domains to block—some curated by the community, some you write yourself. When a DNS query arrives, Pi-hole checks it against Gravity. Match = blocked. No match = forwarded to your upstream DNS (Cloudflare, Quad9, your ISP, whatever you choose).

You’re not locked into someone else’s definition of “ad”. You can:

  • Add public blocklists (there are thousands; the Pi-hole community maintains a curated index).
  • Whitelist specific domains if a blocklist is too aggressive (your bank’s ad server, a service you trust).
  • Blacklist individual domains by hand.
  • Create regex rules for pattern matching (block anything matching .*tracker.*\.example\.com).

This granularity is why Pi-hole beats browser extensions for power users. You set the rules once; they apply everywhere.

Real-world impact

On a typical home network, Pi-hole blocks 15–30% of all DNS queries. That’s not just ads—it’s tracking pixels, analytics beacons, malware C&C domains, and the thousand invisible requests that follow you across the web.

Measurable effects:

  • Bandwidth: fewer requests = less data. On metered connections, this adds up.
  • Speed: pages load faster when ad servers aren’t slow or unreachable.
  • Battery: mobile devices spend less time waiting for ad requests to time out.
  • Sanity: your network logs show what’s actually being requested. You see the shape of tracking infrastructure.

It’s not a magic bullet—some ads are served from the same domain as content, so blocking them breaks the site. But for the majority of tracking and advertising infrastructure, DNS-level blocking is clean and effective.

Getting started

1. Choose your hardware

Raspberry Pi is the canonical choice (hence the name), but Pi-hole runs on any Linux box: an old laptop, a VPS, a NAS, a dedicated mini-PC. You need:

  • Linux (Debian, Ubuntu, Fedora, etc.).
  • ~50 MB disk space (blocklists cache locally).
  • Network access to your router’s admin panel (to set Pi-hole as your DNS server).

For a home network, a Raspberry Pi 4 or 5 is overkill—a Pi Zero 2 W handles hundreds of devices. If you already have a home server, run Pi-hole in a container on it.

2. Install Pi-hole

Pi-hole provides a one-line installer:

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

The installer asks a few questions (upstream DNS, interface, admin password) and sets up the web dashboard. On a fresh Raspberry Pi OS install, this takes 5–10 minutes.

Alternatively, use Docker:

docker run -d \
  --name pihole \
  -p 53:53/udp \
  -p 53:53/tcp \
  -p 80:80 \
  -e TZ=UTC \
  -e WEBPASSWORD=yourpassword \
  pihole/pihole:latest

Both paths are documented in the official Pi-hole docs.

3. Point your router to Pi-hole’s DNS

Once Pi-hole is running, log into your router’s admin panel and set the DNS server to Pi-hole’s IP address. Every device on your network will now use Pi-hole for DNS lookups.

If your router doesn’t support custom DNS (some ISP-provided routers don’t), you can set Pi-hole as DNS on individual devices, but you lose the network-wide benefit.

4. Load blocklists

Access Pi-hole’s web dashboard (usually http://pi-hole.local/admin or http://<pi-hole-ip>/admin). Go to Adlists and add blocklists. The community maintains a curated list of blocklists; start with the green-rated ones (low false-positive rate).

After adding lists, Pi-hole downloads and compiles them into Gravity. This takes a minute or two the first time.

5. Monitor and refine

The Query Log shows every DNS request. You’ll see patterns: which domains your devices request, which are blocked, which leak through. If a blocklist is too aggressive (breaks a site you use), whitelist that domain. If you notice a tracker, blacklist it by hand.

This is the ongoing work. Pi-hole is not “set and forget”—it’s “set, then tune”.

Honest gotchas

Requires network admin access. You need to change your router’s DNS settings or configure each device individually. If you rent your router from your ISP or live in a shared network, this might not be possible.

DNS understanding helps. If you don’t know what DNS is or how it works, the setup is straightforward, but troubleshooting is harder. A broken DNS config breaks your entire network’s internet access.

Blocklists can be too aggressive. A poorly chosen blocklist might block legitimate services (your bank’s login server, a SaaS app’s API). You need to be willing to whitelist and debug.

Not a VPN. Pi-hole blocks DNS queries, but it doesn’t encrypt them. Your ISP still sees which domains you request. If you need privacy from your ISP, layer Pi-hole with a VPN or a privacy-focused upstream DNS (Quad9, NextDNS).

Requires uptime. If Pi-hole goes down, your network’s DNS goes down. Devices will fall back to a backup DNS (if configured), but you lose the blocking. Run it on reliable hardware or set up a second Pi-hole for redundancy.

What to do next

Start with the Pi-hole documentation. If you want the deeper layer—cryptographic proof that your DNS queries haven’t been tampered with—look into DNSSEC. For the truly paranoid, combine Pi-hole with a privacy-focused upstream DNS like Quad9 or NextDNS.

If you’re building a self-hosted stack and want to go further, Pi-hole pairs well with other network tools: Unbound for recursive DNS resolution, Wireguard for remote access, or a full pfSense router for advanced filtering.

Start small: one Raspberry Pi, one blocklist, one week of monitoring. You’ll see what Pi-hole catches and what it misses. Then tune from there.