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Pi-hole is worth setting up if you want DNS-level filtering for a home network and are comfortable maintaining a small always-on Linux service. It can apply domain blocklists to many devices without installing software on each one, but it is not a universal ad blocker, privacy service, or “set it and forget it” appliance. Devices must actually use Pi-hole for DNS, and a host or network misconfiguration can interrupt name resolution.
What Pi-hole is
Pi-hole is a local DNS sinkhole. A device asks it to translate a domain name such as example.com into an IP address; Pi-hole checks that request against its blocklists and either returns a blocking response or resolves it normally. The project describes this as protecting devices from unwanted content without installing client software on each device (Pi-hole documentation).
Filtering happens at the domain/DNS layer. That makes Pi-hole useful for household devices, phones, smart TVs and other clients that can be configured to use a network DNS server. It does not inspect every web connection, remove all advertising inside an app, or guarantee anonymity.
How a DNS request moves through Pi-hole
- Client sends a DNS query: the device must be configured to use the Pi-hole host.
- Local cache is checked: a recent answer can be returned without another upstream lookup.
- Blocklists are checked: a matching domain is answered in the configured blocking mode.
- Allowed queries are forwarded: a request that is neither cached nor blocked goes to the upstream DNS server you select. Pi-hole’s resolver documentation describes this flow (resolver and Unbound guide).
The default and recommended NULL blocking mode returns 0.0.0.0 for IPv4 and :: for IPv6 blocked queries. Other response modes are available for particular network requirements (blocking modes).
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What you need to run Pi-hole
Hardware and storage
The current prerequisites specify 512 MB of RAM, at least 2 GB of free disk space, and 4 GB recommended. These are project requirements, not performance benchmarks (official prerequisites).
You do not need a Raspberry Pi. Any suitable, reliable device running a supported operating system can host the service. That may be an existing small Linux computer, virtual machine or server, provided it remains available when clients need DNS.
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Supported operating systems and CPU architectures
Officially supported operating systems include Alpine, Armbian OS, Debian, CentOS Stream, Fedora, Raspberry Pi OS and Ubuntu. Only actively maintained versions are supported. Prebuilt FTL binaries cover x86_64, armv6, armv7, armv8/aarch64 and riscv64; other architectures require compiling FTL from source. Check the prerequisites page for the current support list before choosing hardware.
Network prerequisites
- Give the host a stable address, either a static address or a DHCP reservation.
- Ensure DNS port 53 (TCP and UDP) is available; optional DHCP operation uses additional DHCP ports.
- Check that another service is not already occupying those ports (installation and configuration documentation).
Installation choices: bare metal or Docker
Pi-hole documents both a conventional host installation and Docker deployment. Neither is a universal winner; choose the model that matches how you already operate Linux services.
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| Approach | Best fit | What you manage | Important consideration |
|---|---|---|---|
| Bare metal | A dedicated or existing Linux host managed directly | Packages, service configuration and host updates | Simple network integration, but the host’s ports and operating system are part of the deployment |
| Docker | A machine where you already run containers | Container image, volumes, networking and upgrades | DNS/DHCP port mapping and container networking must be planned carefully |
The project also provides a one-step shell installer. Because it pipes an installer to a shell, some administrators will prefer to inspect or download the script first; Pi-hole documents those alternatives on its installation pages (basic installation, installation overview).
Making the whole network use Pi-hole
Installing the software does not automatically move your clients to it. The usual approach is to set the Pi-hole address as the DNS server distributed by your router’s DHCP service.
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- Reserve or assign a stable IP address for the Pi-hole host.
- In the router’s LAN/DHCP settings, set the primary DNS server to that address.
- Renew DHCP leases or reconnect clients so they receive the new DNS setting.
- Check Pi-hole’s query log or dashboard to confirm that clients are sending requests.
If the router cannot advertise a custom DNS server, disable its DHCP service and enable Pi-hole’s DHCP server instead. That makes Pi-hole responsible for handing out addresses and DNS settings. Manually setting DNS on each device is another option, but it is harder to maintain and easy to miss when new devices join (post-install guidance).
Important failure mode
Clients configured with Pi-hole as their only DNS server depend on its host being available. The documentation also warns that if the Pi-hole host uses Pi-hole as its own upstream DNS and Pi-hole fails, the host loses DNS resolution. Keep a recovery path—such as console access and a known temporary DNS setting—before changing the host’s resolver.
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Choosing an upstream resolver
Allowed queries are forwarded to the upstream DNS provider configured in Pi-hole unless they are answered from cache. Your choice determines which provider receives those allowed lookups and can affect policy, logging and latency. Pi-hole itself does not make upstream traffic anonymous.
For a forwarding setup, select an upstream provider you trust and document that choice for everyone who administers the network. If you want recursive resolution on your own network, Pi-hole can be paired with Unbound on the same device; the official guide presents this as an optional configuration, not a requirement (Unbound guide).
What Pi-hole blocks—and what it cannot promise
Where it is effective
- Requests to domains present on your enabled blocklists can be refused for every client using Pi-hole DNS.
- One network service can cover many device types without installing a client on each one.
- Caching can answer repeated DNS requests locally.
Where DNS filtering falls short
- Devices that use another DNS server, a hard-coded resolver, a VPN, or certain encrypted-DNS features may bypass Pi-hole.
- Ads and trackers served from the same domain as wanted content can be difficult or impossible to separate at DNS level.
- DNS filtering does not inspect page content, block every in-app advertisement, or hide all of your internet traffic.
There is no official universal blocking percentage established for Pi-hole. Results depend on blocklists, client behavior, applications and network configuration, so a single percentage would be misleading.
Strengths and trade-offs
| Strengths | Trade-offs |
|---|---|
| Central filtering for multiple devices | Only clients that actually use Pi-hole are covered |
| Modest documented hardware requirements | You must provide and maintain an always-on host |
| Local cache and a web interface | Router, DHCP and port configuration can be complex |
| Optional DHCP and IPv4/IPv6 support are documented capabilities | A host failure can disrupt DNS for dependent clients |
| Choice of forwarding upstreams or optional Unbound recursion | DNS filtering is not full privacy or anonymity |
Is Pi-hole worth setting up in 2026?
It is a good fit when
- You want one control point for DNS filtering across a home or small network.
- You already own a supported Linux-capable device or are willing to run one continuously.
- You are comfortable changing router DHCP/DNS settings and troubleshooting name resolution.
- You want visibility into DNS requests and the option to use your own upstream or Unbound.
Consider alternatives when
- You cannot keep a host powered and reachable reliably.
- Your priority is guaranteed removal of every advertisement inside websites and apps.
- You need anonymity or encrypted, end-to-end traffic protection rather than DNS control.
- Your network contains clients that cannot be directed to your DNS server.
For the right owner, Pi-hole’s value is control rather than a guaranteed blocking rate: a documented, configurable DNS layer that can serve many devices. The setup is modest, but the network design and ongoing availability are your responsibility.
Quick Recap
Quick pre-install checklist
- Supported, actively maintained operating system and compatible CPU architecture
- At least 512 MB RAM and 2 GB free disk space (4 GB recommended)
- Stable IP address or DHCP reservation
- DNS port 53 available, with DHCP ports available if you will use Pi-hole DHCP
- Router plan for advertising Pi-hole DNS, or a plan to replace router DHCP
- Recovery access and a temporary DNS option if the Pi-hole host fails
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