Pi-hole is a network-wide ad blocker that filters DNS requests to block ads, trackers, and malicious domains before they reach any device on your network. Instead of installing ad blockers on every phone, tablet, laptop, and smart TV individually, Pi-hole handles blocking at the network level, covering every connected device automatically, including devices that cannot run browser extensions like smart TVs, game consoles, and IoT gadgets.
Setting up Pi-hole takes 15 to 30 minutes and requires either a Raspberry Pi ($35 to $80), an old PC, or a Docker container on existing hardware. Once running, Pi-hole blocks 15 to 30 percent of all DNS queries on a typical home network, which translates to faster page loads, reduced bandwidth consumption, and a cleaner browsing experience across every device. No per-device configuration, no browser extensions, no subscription fees. Here is the complete setup process.
How Pi-hole Blocks Ads at the Network Level
Every time a device on your network tries to load a webpage, stream a video, or open an app, it sends a DNS query to convert a domain name (like ads.doubleclick.net) into an IP address. Pi-hole intercepts these DNS queries and checks each domain against a blocklist. If the domain is an advertising server, tracking pixel, telemetry endpoint, or known malicious domain, Pi-hole returns a null response instead of the real IP address. The ad or tracker never loads because the device never connects to it.
This approach has three advantages over browser-based ad blockers. First, it blocks ads in apps, not just browsers. YouTube app pre-roll ads, Spotify’s between-song ads, and in-app banner ads all rely on DNS resolution that Pi-hole can intercept. Second, it blocks tracking and telemetry from smart TVs, voice assistants, robot vacuums, and other IoT devices that silently phone home to data collection servers. Third, it reduces bandwidth usage by preventing ad content from downloading in the first place.
Pi-hole does not modify webpage content. It blocks the DNS resolution for ad-serving domains, which means the ad space on a webpage appears as empty or as a broken image placeholder. Some websites detect this empty space and display “ad blocker detected” messages. Pi-hole’s community maintains allowlists for domains that break website functionality when blocked.
Hardware Options for Running Pi-hole
Pi-hole is lightweight software that runs on almost any hardware. The DNS filtering process uses minimal CPU and RAM because it simply compares domain names against a text list. A Raspberry Pi Zero handles hundreds of DNS queries per second without breaking a sweat.
A Raspberry Pi 4 or Pi 5 ($55 to $80 plus $15 for a case and power supply) is the most popular Pi-hole platform. Its low power consumption (3 to 5 watts) means it costs approximately $5 per year in electricity to run 24/7. The Pi 4’s 1GB model is sufficient for Pi-hole, but the 2GB or 4GB models give you headroom to run additional services alongside Pi-hole.
An old laptop or mini PC you already own runs Pi-hole with zero additional hardware cost. Install a lightweight Linux distribution (Ubuntu Server or Debian) and run the Pi-hole installer. The machine does not need a monitor, keyboard, or mouse after initial setup because you manage Pi-hole entirely through its web dashboard accessed from any browser on your network.
Docker on an existing server is the cleanest option if you already run a Docker-based home server. Pi-hole’s official Docker image deploys in one command and coexists with other containers. This approach requires no dedicated hardware and uses approximately 100MB of RAM.
Installing Pi-hole on a Raspberry Pi
Start by installing Raspberry Pi OS Lite (the headless version without a desktop environment) on a microSD card using the Raspberry Pi Imager tool. In the imager’s advanced settings, enable SSH access and configure your WiFi credentials so the Pi connects to your network automatically on first boot.
Insert the microSD card, connect the Raspberry Pi to your network via Ethernet (recommended for DNS stability) or WiFi, and power it on. Find the Pi’s IP address from your router’s DHCP client list or use a network scanner app. SSH into the Pi from your computer’s terminal using the username and password you configured in the imager.
Run the official Pi-hole installer by executing the automated install script from the terminal. The installer launches an interactive setup wizard that asks you to choose an upstream DNS provider (Cloudflare 1.1.1.1 or Google 8.8.8.8 are common choices), select default blocklists, configure the web admin interface, and set a static IP address for the Pi.
The installer completes in 2 to 5 minutes. It displays the web admin dashboard URL (typically http://[Pi-IP-address]/admin) and a randomly generated password. Save this password. You can change it later through the terminal. The web dashboard is now accessible from any browser on your network.
Installing Pi-hole With Docker Compose
If you prefer Docker, Pi-hole runs in a container alongside your other self-hosted services. Create a docker-compose.yml file that defines the Pi-hole service with network mode set to host or with ports 53 (DNS), 80 (web interface), and 443 mapped. Set environment variables for the timezone and web password.
The Docker approach offers easier updates (pull the new image and restart the container), simple backups (copy the bind-mounted configuration directories), and clean isolation from the host system. If something goes wrong, delete the container and redeploy from the compose file. Your configuration and blocklists persist in the mounted volumes.
One Docker-specific consideration: port 53 conflicts with systemd-resolved on Ubuntu. If you see a port binding error, disable the systemd-resolved stub listener by editing the resolved configuration file and setting the DNS stub listener to no, then restart the service. This frees port 53 for Pi-hole’s DNS server.
Configuring Your Router to Use Pi-hole
After Pi-hole is running, you need to tell your network devices to use it as their DNS server. There are two approaches: router-level configuration (recommended) and per-device configuration.
Router-level configuration changes the DNS server in your router’s DHCP settings so every device that connects to your network automatically uses Pi-hole. Log into your router’s admin panel (typically 192.168.1.1 or 192.168.0.1), find the DHCP settings, and change the primary DNS server to your Pi-hole’s IP address. Set the secondary DNS to the same Pi-hole IP address (not a public DNS like 8.8.8.8, which would bypass Pi-hole when the primary is slow to respond).
After saving the router settings, devices renew their DHCP lease and receive Pi-hole as their DNS server. This process happens automatically but can take up to 24 hours for all devices. Force an immediate renewal by disconnecting and reconnecting a device from WiFi, or restart the device.
Per-device configuration is useful if you want to test Pi-hole on specific devices before rolling it out network-wide. On iPhone, go to Settings, WiFi, tap the info icon next to your network, then Configure DNS, switch to Manual, and add your Pi-hole’s IP address. On Windows, change the DNS in your network adapter settings. On Android, use Settings, Network, WiFi, Advanced, and change DHCP to Static with your Pi-hole’s DNS.
Adding Blocklists for Better Ad Blocking
Pi-hole’s default blocklist catches approximately 100,000 domains. Adding community-maintained blocklists increases coverage to 500,000+ domains, blocking significantly more ads, trackers, and malicious domains. However, larger blocklists increase the chance of false positives (legitimate domains being blocked).
Access the Pi-hole web dashboard and navigate to Group Management, then Adlists. Add additional blocklist URLs from curated sources. The most popular community blocklists include Steven Black’s unified hosts list (blocks ads plus optional porn, social media, and gambling domains), OISD blocklist (balanced blocking with minimal false positives), and the Firebog’s Ticked lists (curated collection verified to have minimal false positives).
After adding blocklists, update Pi-hole’s gravity database from the web dashboard (Tools, Update Gravity) or via the terminal. Pi-hole downloads all blocklists, deduplicates them, and compiles them into its filtering database. This process takes 30 to 60 seconds and should be repeated weekly to catch newly discovered ad and tracking domains.
Allowlisting Domains That Break When Blocked
Some websites and services break when their domains are blocked because they bundle functional content delivery with their ad-serving domains. The most common breakage occurs with Microsoft services (login.microsoftonline.com), Apple services (setup.icloud.com), and streaming service authentication (various CDN domains).
Pi-hole’s web dashboard includes an Allowlist section where you add domains that should never be blocked. When a website or app stops working after Pi-hole setup, check the Pi-hole Query Log (visible on the dashboard) to identify recently blocked domains. Allowlist the functional domain and the site resumes working.
Community-maintained allowlists provide pre-built lists of commonly needed domains for services like Netflix, Spotify, Xbox Live, PlayStation Network, and Apple services. Adding one of these allowlists during initial setup prevents the most common breakage scenarios.
Pi-hole Dashboard: Monitoring Your Network
Pi-hole’s web dashboard provides real-time visibility into every DNS query on your network. The main dashboard shows: total queries today, queries blocked (with percentage), blocklist size, and clients connected. A timeline graph visualizes query volume and blocking ratio over the last 24 hours.
The Query Log shows every individual DNS query with the requesting client, the queried domain, the response (allowed, blocked, cached, or forwarded), and the response time. This log is invaluable for troubleshooting. When a specific device or app misbehaves, filter the Query Log by that device’s IP address to see exactly which domains it tried to reach and which were blocked.
The Top Domains and Top Clients sections reveal which domains are most requested and which devices generate the most traffic. You will likely discover that smart TVs and IoT devices generate thousands of tracking requests daily that you never knew about. Amazon Fire TV devices, Samsung TVs, and robot vacuums are among the most aggressive tracker generators.
Keeping Pi-hole Updated and Maintained
Pi-hole updates approximately monthly with bug fixes, performance improvements, and blocklist processing enhancements. Update through the terminal by running the Pi-hole update command. Always backup your configuration before updating by exporting your settings from the web dashboard (Settings, Teleporter).
Regular maintenance tasks: update blocklists weekly (automated via a cron job or Pi-hole’s built-in scheduler), review the Query Log monthly for false positives affecting your household, and check the Pi-hole dashboard for any devices generating unusually high query volumes (which could indicate malware phoning home).
If Pi-hole goes down (Raspberry Pi crashes, Docker container stops), your entire network loses DNS resolution and internet access stops working. Mitigate this by configuring your router with a secondary DNS (like 1.1.1.1) that activates only if Pi-hole is unreachable. Some routers do not properly failover; in that case, running two Pi-hole instances (primary and secondary) on separate hardware provides redundancy.
Does Pi-hole block YouTube ads?
Pi-hole blocks some YouTube ads served from third-party ad domains but cannot block YouTube ads served from the same domains as video content (youtube.com, googlevideo.com). Blocking these domains would break video playback. For comprehensive YouTube ad blocking, combine Pi-hole with a browser extension like uBlock Origin or use alternative YouTube frontends like FreeTube or NewPipe.
Does Pi-hole slow down internet speed?
Pi-hole actually speeds up browsing by eliminating the time spent downloading ads, tracking scripts, and telemetry data. DNS query resolution through Pi-hole adds less than 5 milliseconds of latency compared to a public DNS server. The net effect is faster page loads because blocked content never downloads.
Can Pi-hole block ads on phones and tablets?
Yes. Pi-hole blocks ads in any app or browser on any device connected to your network, including phones and tablets. The blocking works at the DNS level, so no app installation or configuration is needed on the phone. Ads return when the phone leaves your home network unless you connect back via VPN.
Is Pi-hole free?
Pi-hole is 100 percent free and open-source software. There are no subscription fees, premium tiers, or paid features. All functionality is available at no cost. The only expense is the hardware to run it: a Raspberry Pi ($35-80), an old computer ($0), or Docker on an existing server ($0). Donations to the Pi-hole project are optional.
What happens to my network if Pi-hole stops working?
If Pi-hole goes offline, devices cannot resolve DNS queries and internet access stops for your network. Configure a secondary DNS in your router settings (like 1.1.1.1) as a fallback. For maximum reliability, run two Pi-hole instances on separate hardware so your network continues functioning if one fails.
