Pi-hole DNS — Network-Wide Ad Blocking Guide

Pi-hole is a DNS-based ad blocker that runs on a Raspberry Pi or any Linux server. It sits on your network and intercepts DNS queries, blocking requests to known advertising and tracking domains. Every device on your network benefits from ad blocking without installing anything.

It works at the DNS level. When a device on your network tries to resolve a domain that is on Pi-hole's blocklist, Pi-hole returns a null response. The device does not connect to the ad server. The ad never loads. The tracking script never executes.

Pi-hole is open source and has been around since 2015. It has a large community, extensive documentation, and regular updates. It is one of the most popular self-hosted projects on the internet.

How Pi-hole Works

Pi-hole runs a DNS forwarder that accepts queries from devices on your network. It checks each requested domain against its blocklists. If the domain is on a blocklist, Pi-hole returns a black hole response (the origin of the name). The requesting device gets a null IP, and the ad domain is never contacted.

If the domain is not blocked, Pi-hole forwards the query to an upstream DNS resolver of your choice. You can use Cloudflare, Google, Quad9, or any other DNS provider. Pi-hole caches the response so subsequent queries are faster.

Pi-hole also functions as a DHCP server, though most people use their router for DHCP and Pi-hole for DNS only. The Pi-hole web interface shows detailed statistics: total queries, blocked queries, top blocked domains, top requesting clients, and query history.

How to Set Up Pi-hole

You need a Raspberry Pi (any model from Pi 2 onwards works) or a Linux server. Install Raspberry Pi OS Lite for a minimal setup. Connect the Pi to your network via Ethernet for reliability.

Install Pi-hole with a single command: curl -sSL https://install.pi-hole.net | bash. The installer walks you through the configuration. You select the upstream DNS provider, choose blocklists, and set a static IP address for the Pi-hole.

After installation, access the admin web interface at http://pi.hole/admin or http://<your-pi-ip>/admin. The default password is shown during installation. Change it in the settings.

Configure your router to use Pi-hole as the primary DNS server. Log into your router, find the DNS settings, and set the DNS server to the Pi-hole's IP address. After saving, every device on your network will use Pi-hole for DNS resolution, and ad blocking starts immediately.

Blocklists and Configuration

Pi-hole comes with a default blocklist that covers most advertising and tracking domains. You can add more blocklists to expand coverage. Popular additional lists include OISD (a comprehensive blocklist), NoTracking (tracker-specific), and specific lists for malware, phishing, and adult content.

Do not add too many blocklists. Redundant lists waste memory and can cause performance issues. Start with the default list and the OISD list. Monitor the false positive rate in the query log. If a legitimate site is blocked, add it to the whitelist.

Pi-hole's whitelist and blacklist features let you customize blocking. Whitelist domains that are incorrectly blocked. Blacklist additional domains you want to block beyond the blocklists. The web interface makes this easy to manage.

Regularly update Pi-hole and its blocklists. Pi-hole updates gravity (its blocklist database) weekly by default. Run pihole -up to update Pi-hole itself and pihole -g to update gravity manually.

Advanced Pi-hole Features

Pi-hole can run alongside Unbound to create a fully self-hosted DNS resolution stack. Pi-hole handles blocking and caching, while Unbound provides recursive DNS resolution with DNSSEC validation. This eliminates reliance on any external DNS provider.

Conditional forwarding lets Pi-hole resolve local hostnames from your router's DHCP lease list. Without this, devices on your network cannot reach each other by hostname. Configure it in Settings > DNS > Conditional Forwarding.

Pi-hole supports multiple blocklist management through AdLists. You can add, remove, and update blocklists from the admin interface. Each list shows the number of domains it blocks and when it was last updated.

For comprehensive ad blocking, consider using Pi-hole alongside a browser ad blocker like uBlock Origin. Pi-hole blocks ads on all devices (including smart TVs and IoT), while uBlock Origin handles cosmetic filtering and complex ad formats that DNS blocking alone cannot catch.

For an alternative to Pi-hole with similar capabilities, see our AdGuard Home guide.

Pi-hole Limitations

DNS-level ad blocking cannot block all ads. Some ads come from the same domain as the content. For example, YouTube ads are served from the same servers as YouTube videos. Pi-hole cannot distinguish between the two because the DNS query is the same.

Pi-hole blocks ads by domain. This means it cannot block inline ads, sponsored content, or ads that use the same CDN as legitimate content. For those, you need browser-level ad blocking.

Some websites break when ads are blocked. They detect that the ad did not load and refuse to show content, asking you to disable your ad blocker. For these sites, you can temporarily disable Pi-hole or add them to the whitelist.

Pi-hole requires a dedicated device running 24/7. The Raspberry Pi consumes minimal power, but it is still an additional device on your network. If the Pi goes down, DNS stops working unless you have configured a fallback DNS server.