You can block a large portion of advertising and tracking traffic across your entire home network by running a local DNS filtering server and configuring your router to use it as the default DNS resolver. Tools such as Pi-hole and AdGuard Home inspect DNS requests from phones, computers, smart TVs, tablets, consoles, and IoT devices, then refuse to resolve domains included on configured blocklists.
The main advantage is centralization. Instead of installing an ad-blocking extension on every browser and trying to control applications that do not support extensions, you manage filtering from one place. A small Raspberry Pi, mini PC, virtual machine, NAS, or always-on Linux system is usually enough.
DNS filtering does have limitations. It cannot reliably remove advertisements served from exactly the same domains as legitimate content, and devices using their own encrypted or hardcoded DNS resolvers may bypass your local server. The setup therefore works best as one layer in a broader filtering strategy. Read on to see how to deploy it correctly without accidentally breaking DNS for your household.
Key takeaways:
- A local DNS filtering server can block advertising, tracking, telemetry, and selected malicious domains for many devices at once.
- Pi-hole and AdGuard Home are both practical choices that can run on inexpensive always-on hardware.
- Your router should distribute the filtering server as the DNS resolver through DHCP for network-wide coverage.
- DNS filtering works best when combined with careful blocklist management and browser-level content blocking where necessary.
What does network-wide DNS ad blocking actually do?
Network-wide DNS blocking prevents devices from resolving domain names that match entries on configured deny lists. When an application tries to contact an advertising or tracking hostname, the request reaches your filtering DNS server before the application establishes a connection with that destination.
Imagine that a smart TV application wants to connect to ads.example-ad-network.com. Normally, a DNS resolver would translate that hostname into an IP address. A filtering resolver checks the requested name against its database first. If the domain is blocked, it returns a blocking response instead of the usable destination address, so the application cannot establish the normal connection to that advertising server.
The DNS path in a basic configuration looks like this:
Phone / Laptop / TV | v Home Router | v Pi-hole or AdGuard Home | +-- Blocked domain -> Block response | +-- Allowed domain -> Upstream DNS resolver | v InternetThis approach is particularly useful for devices where traditional browser extensions are unavailable. Typical examples include:
- smart TVs and streaming boxes,
- mobile applications,
- tablets and smartphones,
- game consoles,
- IoT devices,
- network appliances,
- desktop applications that send telemetry outside a browser.
It can also reduce background tracking and telemetry that users would otherwise never see. DNS query logs often reveal how frequently applications contact analytics, advertising, or device-vendor infrastructure even while apparently idle.
Which software should you use for a home DNS server?
For most households, Pi-hole or AdGuard Home provides the best balance between simple administration, DNS filtering, logging, and low hardware requirements. Both can act as the central resolver that receives DNS requests from clients and applies filtering rules before forwarding allowed queries upstream.
| Feature | Pi-hole | AdGuard Home |
|---|---|---|
| Main purpose | DNS filtering and network-level blocking | DNS filtering and network-level blocking |
| Administration | Web interface plus command-line tools | Web interface with integrated setup wizard |
| DHCP capability | Yes | Yes |
| Client query visibility | Detailed query logging and statistics | Detailed query logging and statistics |
| Good fit | Users wanting a mature Linux-focused ecosystem and extensive community documentation | Users wanting a streamlined interface and integrated DNS configuration options |
Pi-hole is especially popular in Raspberry Pi and homelab environments. It is lightweight enough that the official project lists 512 MB of RAM as sufficient, with at least 2 GB of free storage and 4 GB recommended. A static IP address or DHCP reservation is required because clients must always know where to find the DNS server.
AdGuard Home follows the same general architecture but packages many DNS-related controls into one interface. During its initial setup, the service provides a web configuration wizard, while normal DNS service listens on port 53.
From my testing, the actual difference in perceived ad blocking usually depends more on the chosen filters and network configuration than on the basic resolver itself. A carefully configured Pi-hole can outperform a poorly configured AdGuard Home instance and vice versa.
What hardware and network settings do you need before installation?
You need an always-on device with a stable LAN address, access to your router’s DHCP or DNS settings, and an operating system capable of running your chosen DNS filtering software. DNS itself creates very little computational load in a normal household, so there is rarely a reason to dedicate powerful hardware to the task.
Suitable platforms include:
- a Raspberry Pi or similar ARM single-board computer,
- an inexpensive Intel or AMD mini PC,
- a Linux virtual machine,
- a container host,
- a compatible NAS,
- an existing home server that remains online continuously.
A dedicated device has one practical advantage. DNS remains available when you reboot or experiment with other services on your primary server. Because DNS is required for normal browsing, an unreliable DNS host can make a perfectly functional Internet connection appear completely broken.
The most important preparation step is assigning the server a predictable address. For example:
Router: 192.168.1.1 DNS server: 192.168.1.10 DHCP range: 192.168.1.100 - 192.168.1.250You can configure the DNS machine with a static address at operating-system level, but a DHCP reservation on the router is often easier to manage. The important part is that 192.168.1.10 does not unexpectedly become 192.168.1.137 after a reboot.
Before installing anything, also check which service currently owns port 53:
sudo ss -lntup | grep ':53 'Existing DNS services such as systemd-resolved, another resolver, or a previous DNS container can cause binding conflicts.
How do you install Pi-hole as a home DNS server?
The simplest Pi-hole installation is to prepare a supported Linux host, assign it a stable IP address, run the official installer, and select an upstream DNS resolver during configuration. A current Debian, Ubuntu, Raspberry Pi OS, Fedora, Alpine, Armbian, or another officially supported distribution is a sensible starting point.
Update the operating system first:
sudo apt update sudo apt upgradeThe Pi-hole project provides the following automated installer:
curl -sSL https://install.pi-hole.net | bashPiping downloaded scripts directly into a shell is convenient, but security-conscious administrators may prefer to inspect the installer first. The official alternative is to clone the repository and execute the installation script locally:
git clone --depth 1 https://github.com/pi-hole/pi-hole.git Pi-hole cd "Pi-hole/automated install/" sudo bash basic-install.shDuring installation, you will configure several elements:
- the network interface used by the server,
- the server’s IP configuration,
- an upstream DNS provider,
- DNS filtering components,
- the administrative web interface.
For upstream DNS, you can initially choose a public resolver supported by Pi-hole. Common configurations use providers such as Cloudflare or Quad9. You can replace the upstream service later without reinstalling Pi-hole.
After installation, open the Pi-hole administration interface from another machine on the LAN and confirm that the resolver is running. Do not change your entire network yet. Test the server directly first.
On Linux or macOS:
dig example.com @192.168.1.10On Windows:
nslookup example.com 192.168.1.10If the query returns a valid answer and appears in the Pi-hole query log, the basic resolver path is working.
How do you point every device to your DNS server?
The correct network-wide method is to configure your router’s DHCP service to advertise the local filtering server as the DNS resolver for LAN clients. New DHCP leases will then contain the Pi-hole or AdGuard Home address automatically.
Router interfaces vary, but the relevant setting is usually located under one of these sections:
- LAN,
- DHCP Server,
- Local Network,
- DNS Settings,
- Network Services.
Using the example configuration above, enter:
Primary DNS: 192.168.1.10Do not automatically put a public service such as 1.1.1.1 or 8.8.8.8 into the secondary DNS field. Many clients treat multiple DNS servers as alternatives rather than a strict primary and emergency backup. If you advertise a public resolver next to Pi-hole, some requests can bypass filtering completely.
If redundancy is required, run a second filtering resolver instead:
Primary DNS: 192.168.1.10 Secondary DNS: 192.168.1.11After changing DHCP settings, existing devices may keep their previous DNS configuration until the lease is renewed. You can:
- disconnect and reconnect Wi-Fi,
- renew the DHCP lease manually,
- restart the device,
- wait for the existing lease to expire.
If your router does not allow custom DNS servers to be distributed through DHCP, both Pi-hole and AdGuard Home can provide DHCP themselves. In that situation, disable the router’s DHCP server before enabling the replacement. Two competing DHCP servers on the same LAN can produce unpredictable client configurations.
Do not forget IPv6. A network may send IPv4 DNS traffic through Pi-hole while simultaneously advertising an ISP-provided IPv6 DNS resolver. Clients can then bypass filtering without anything appearing obviously wrong. If IPv6 is enabled, configure your router to advertise the filtering resolver for IPv6 as well.
How do you improve privacy, reliability, and blocking accuracy?
You improve a DNS filtering setup by using carefully selected blocklists, monitoring false positives, adding resolver redundancy where necessary, and optionally running your own recursive resolver. Installing Pi-hole is only the beginning. The quality of the configuration determines how useful it becomes over time.
Should you add more blocklists?
You should add blocklists selectively rather than subscribing to every large list you can find. A huge domain database may look impressive in a dashboard, but the raw number of blocked domains is not a meaningful quality metric.
A sensible approach is to maintain lists that target specific categories:
- advertising networks,
- tracking and analytics systems,
- known telemetry endpoints,
- malware and phishing infrastructure,
- optional content categories required by your household.
Every additional list increases the possibility of false positives. When an application suddenly stops logging in, a smart TV store fails to load, or an embedded widget disappears, check the DNS query log before disabling the entire filtering system.
Community reports repeatedly show that application breakage is usually handled by identifying the blocked hostname and creating a narrowly scoped allow rule rather than abandoning network-level filtering completely.
Should you use Unbound with Pi-hole?
Unbound is useful if you want Pi-hole to perform recursive DNS resolution locally instead of forwarding every permitted query to a traditional public DNS resolver. Pi-hole’s official documentation provides a supported architecture in which Unbound runs on the same host and listens locally on a separate port.
The package can be installed on Debian-based systems with:
sudo apt install unboundAfter Unbound is configured, Pi-hole can use a local address such as:
127.0.0.1#5335Instead of sending every uncached request directly to one public recursive provider, Unbound can perform the recursive process itself. Cached queries are then served locally, while new lookups are resolved through the DNS hierarchy.
Do not expose your recursive resolver directly to the public Internet. A resolver that accepts unrestricted external queries can be abused as part of DNS reflection and amplification attacks. Restrict DNS service to trusted LAN interfaces, firewall WAN access to port 53, and use a VPN when remote devices need access to the home resolver.
Why are some ads still visible after DNS blocking?
Some ads remain because DNS filtering can block entire hostnames, but it cannot inspect individual URLs, page elements, or advertising content served from the same hostname as legitimate content. That limitation comes directly from the level at which DNS filtering operates.
Suppose a website loads articles from:
media.example.com/article-videoand advertisements from:
media.example.com/video-adDNS sees only media.example.com. It cannot selectively block the second path while preserving the first. Blocking the hostname would remove both resources.
This is why DNS-level filtering does not fully replace browser content blockers. Browser extensions can inspect requests and page structure with much more granularity.
Other common reasons for bypasses include:
- applications with hardcoded DNS resolvers,
- browsers configured to use a custom DNS-over-HTTPS provider,
- Android devices configured with an independent Private DNS provider,
- IPv6 clients receiving an external resolver from the router,
- advertising delivered from first-party infrastructure,
- cached DNS answers that were obtained before filtering was enabled.
DNS-over-HTTPS deserves particular attention. Instead of sending a normal DNS request to port 53, a browser can send an encrypted lookup over HTTPS to an external resolver. Mozilla explicitly documents that manually enabled DoH can bypass the local DNS resolver and therefore defeat policies such as local filtering.
For a personal network, check browser secure DNS settings and Android Private DNS configuration before assuming Pi-hole is malfunctioning. Network administrators with managed firewalls can implement stricter DNS policies, but blocking every possible encrypted DNS endpoint becomes a substantially more complex networking problem.
How do you test and troubleshoot a DNS server for home?
You should verify which resolver the client is actually using, test direct queries against the filtering server, inspect its query log, and check IPv4 and IPv6 independently. Most apparent Pi-hole or AdGuard Home failures come from traffic never reaching the server in the first place.
Start by checking your current resolver.
On Windows:
ipconfig /allLook for the DNS Servers field. It should contain the address of your local resolver.
On Linux systems using systemd:
resolvectl statusYou can also compare direct requests:
dig example.com @192.168.1.10 dig example.com @1.1.1.1If the first command fails but the second works, investigate your local resolver. If both work but advertisements are not filtered, inspect the blocklists and query log. If the query never appears in the local log, the client is probably using another DNS route.
A practical troubleshooting order is:
- confirm that the DNS server has its expected static address,
- confirm that the DNS service is running,
- verify that UDP and TCP port 53 are available on the LAN,
- query the server directly with
digornslookup, - confirm that DHCP advertises the correct DNS address,
- renew the client’s DHCP lease,
- inspect the DNS query log,
- check browser DNS-over-HTTPS settings,
- check Android Private DNS where relevant,
- verify the IPv6 DNS configuration.
When changing blocklists, test gradually. If a domain is incorrectly blocked, create the narrowest possible allow rule instead of disabling an entire list. This keeps the system understandable months later when you need to diagnose another application.
For higher availability, two filtering resolvers are useful in homes where DNS downtime is unacceptable. Run them on separate machines or virtual hosts and distribute both addresses through DHCP. Maintenance can then be performed on one instance without removing DNS service from the entire LAN.
