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Pi-hole can block DNS lookups for domains on its rules, but it cannot inspect every browser request or remove every form of tracking. That is why it can reduce some requests to known tracking domains without making browsing anonymous or guaranteeing that every tracker is stopped.
Why doesn’t Pi-hole stop all the tracking?
Pi-hole works as a DNS sinkhole. When a device asks a DNS resolver for a domain’s IP address, Pi-hole can refuse or alter the response if that domain matches a blocking rule. Its documentation describes it as “a DNS (Domain Name Service) sinkhole that protects your devices from unwanted content, without installing any client-side software.” Pi-hole documentation overview
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This is domain-level filtering, not page inspection. Pi-hole does not examine every element on a page or every request a browser makes, and the documentation does not establish that every tracking technique requires a separate DNS lookup that Pi-hole can block.
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Which traffic does Pi-hole cover?
Pi-hole’s DNS blocking applies to requests that reach Pi-hole as the resolver. Devices on a network can benefit when configured to use it, but a device or app whose DNS requests take another path is outside that particular filtering path. The documentation establishes this scope; it does not quantify how often individual apps bypass it. Pi-hole documentation overview
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Pi-hole’s blocking mode also affects how a blocked lookup is answered. The documented modes are NULL (the default and recommended mode), IP-NODATA-AAAA, IP, NXDOMAIN, and NODATA. Depending on the mode and client, a client may handle the response unexpectedly; some modes can lead to HTTPS timeouts. These are configuration-dependent possibilities, not faults that occur in every setup. Pi-hole blocking modes
DNS privacy is not browsing anonymity
Filtering or hiding DNS queries does not hide all the information associated with a connection. Pi-hole’s Tor guidance warns that network observers may still infer visited sites from plaintext HTTP, HTTPS server-name information (SNI), or destination IP addresses. The guide also says its Tor configuration is unsupported, so its examples should not be read as a guarantee about every network or browser. Pi-hole Tor guidance
How a browser content blocker complements Pi-hole
A browser content blocker works at a different layer. uBlock Origin’s project documentation describes filtering network requests and page elements, with default lists that include tracking filters. In a browser where it is installed, this can cover some requests and content that DNS-level filtering does not handle. It does not guarantee that every tracker or tracking method will be stopped. uBlock Origin project documentation
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Using a blocker with its ordinary filter lists adds browser-level filtering while keeping the rules less restrictive than the project’s advanced modes. Pi-hole can still filter DNS lookups for other clients using it as their resolver; the browser extension applies only in the browser where it is installed.
More restrictive rules
uBlock Origin’s hard-mode guidance warns that blocking all third parties makes websites more likely to break and can require user intervention. Stronger rules may block more connections, but they can also interrupt features or content; users may need to adjust rules for individual sites. uBlock Origin blocking modes
Do you need a Raspberry Pi to run Pi-hole?
No specific Raspberry Pi model is required by the cited Pi-hole overview. Pi-hole runs on Linux hardware; an existing compatible Linux computer may be used, while a dedicated device is optional. The overview presents the software as network-wide ad blocking on the user’s own Linux hardware, not as a product tied to one board. Pi-hole documentation overview
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| Approach | Filtering layer | Scope | Main trade-off |
|---|---|---|---|
| Pi-hole | DNS lookups for domains matched by its rules | Clients whose DNS requests use Pi-hole | Does not inspect every page element or browser request; behavior can vary with blocking mode and client |
| Browser content blocker | Browser network requests and page elements | The browser where the blocker is installed | More restrictive rules can break sites and require user intervention |
| Both layers | DNS filtering plus browser request and page-element filtering | Network clients using Pi-hole, plus the covered browser | Broader coverage, but not a guarantee that all tracking is stopped |
For many readers, the practical choice is to use Pi-hole for DNS filtering across clients configured to use it and a browser blocker for additional filtering in the browser. If a site stops working, the browser blocker’s rules may need adjustment. Neither layer should be treated as anonymity protection, and no documented statistic establishes what percentage of tracking Pi-hole blocks or misses.
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