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The reliable way to find a device that is not using Pi-hole is to test that device, not an overall network graph. Record its active DNS servers, test every IPv4 and IPv6 resolver directly, and look for the same test lookup in Pi-hole’s Query Log. Then check router forwarding, VPNs, browser or operating-system secure DNS, and applications that use their own resolver.
A matching Query Log entry proves that that ordinary DNS request reached Pi-hole. A missing entry is only a lead: the device may have used cached data, made no lookup, sent it through encrypted DNS, or reached Pi-hole through a router that hides the original client address.
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What “bypassing Pi-hole” actually means
Pi-hole filters DNS requests that pass through it. A device bypasses that filtering when the lookup goes to another resolver or uses a DNS mechanism that Pi-hole cannot see as an ordinary DNS request. The distinction matters because several situations look like a bypass even when DNS traffic is still going through Pi-hole.
- Another resolver: the client sends a request to a DNS address other than Pi-hole, such as a resolver supplied by a VPN, an application, or a manually configured network profile.
- Encrypted DNS: DNS-over-HTTPS (DoH) carries lookup data inside HTTPS. A normal DNS log check does not account for every DoH connection.
- Router mediation: the router forwards requests for clients and Pi-hole records the router’s address. Filtering may still work, but the dashboard cannot identify the originating device.
- No request at test time: a cached answer, an existing connection, or an application that did not need DNS can leave no corresponding log entry.
Use the word “bypass” only after a controlled lookup demonstrates a different path. Do not label a device a bypasser merely because its name is missing from a graph or because Pi-hole displays the router as the client.
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The evidence you need
Use three observations together:
- Which DNS server addresses are active on the device and interface carrying the test traffic.
- Whether a direct query to each listed resolver returns an answer.
- Whether the same domain and approximate time appear in Pi-hole’s Query Log.
The third observation is specific to the test. If it appears, that lookup reached Pi-hole, even if Pi-hole then forwarded it upstream or applied a group-specific policy. If a non-Pi-hole resolver answers and no matching Pi-hole query exists, investigate an alternate path. A failed query is not proof of enforcement; connectivity, an invalid test name, or an unreachable resolver can produce the same failure.
A practical diagnostic sequence
Work on one device at a time. The following sequence avoids confusing an aggregate statistic with proof about a particular client.
1. Create a controlled lookup
Choose a domain that Pi-hole currently blocks, or choose a distinctive test name that is unlikely to be in cache. If you use a blocked domain, note the expected policy result; if you use a distinctive name, the important result is whether the request appears in the log. Run the test once from one device and write down the exact time, device, network interface, and domain.
Do not diagnose from a network-wide graph alone. A graph can show volume, but it cannot establish which device made one lookup. Open Pi-hole’s Query Log, filter for the test domain and the test time, and record the source address Pi-hole reports.
2. Inspect the device’s active DNS settings
Inspect the interface actually carrying the test: wired and wireless profiles can have different settings, and a VPN or guest network can install another resolver. Record every address shown, including IPv6 addresses.
Linux
For a NetworkManager-managed interface, run:
nmcli device show <interface> | grep .DNSReplace <interface> with the interface used for the test. List each returned IPv4 and IPv6 resolver separately. If the machine has more than one active interface, repeat the check for the interface whose route carries the test traffic.
Windows
Run:
ipconfig /allFind the active LAN adapter and read its DNS Servers entries. Ignore disconnected adapters, but do not ignore a VPN adapter or a virtual interface that is active during the test. Windows can receive an IPv4 resolver through ordinary adapter settings while receiving an IPv6 resolver through router advertisements or DHCPv6, so record both address families.
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Why IPv6 must be checked
A device can use Pi-hole over IPv4 while sending queries to a different IPv6 resolver. Router advertisements and DHCPv6 can advertise a resolver independently of the IPv4 configuration. Configure and test the Pi-hole IPv6 address if your network distributes IPv6; otherwise, an apparently correct IPv4 setup can coexist with an unfiltered IPv6 path.
Query every listed resolver
Reading the configuration is not enough. A listed address may be unreachable, may belong to a local forwarder, or may be selected only under certain conditions. Test each address directly, using the same domain from the controlled lookup.
Linux and macOS
For an IPv4 or IPv6 resolver, use:
dig @<resolver-address> <domain> ARepeat with an AAAA query when IPv6 behavior matters:
dig @<resolver-address> <domain> AAAAReplace the angle-bracketed values with the actual resolver and test name. Run one command for every resolver recorded from the device.
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Use:
nslookup -server=<resolver-address> -q=A <domain>Repeat for every IPv4 and IPv6 address. Keep the command output with the timestamp so you can compare it to Pi-hole’s log.
Read the result alongside the Query Log
| Direct-query result | Pi-hole Query Log | What it establishes | Next action |
|---|---|---|---|
| The resolver answers | The same test appears | That lookup reached Pi-hole. The listed resolver may itself be Pi-hole or a path that forwards to it. | Check the source address and policy result; this is not evidence of a bypass for that lookup. |
| A non-Pi-hole resolver answers | No matching query | The test used another path, assuming the time, domain, and client are correct. | Check VPN settings, router behavior, hard-coded DNS, and encrypted DNS. |
| The query fails | No matching query | Only that this attempt did not produce a normal answer. It does not prove Pi-hole blocked the request. | Verify the resolver address, connectivity, domain, and interface; then repeat. |
| The query answers | A log entry appears under another source address | The request may be passing through a router or local forwarder that changes attribution. | Map the source address to the router’s client and DHCP data before calling it a bypass. |
Use the same test name and a narrow time window. A stale log entry for another device or an old cached result can lead to the wrong conclusion.
Resolve the device identity
Pi-hole may show an IP address instead of a useful hostname, especially when it is not the network’s DHCP server. Compare the source address in the Query Log with the router’s connected-device list and DHCP lease table. Match more than a friendly name when possible: use the IP address, MAC address, interface, and lease time.
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When the router appears as the client
Some routers proxy or forward all client DNS requests. In the documented Fritz!Box arrangement, Pi-hole sees the router as the DNS client, so the dashboard cannot provide per-device attribution or apply client-specific group management based on the original device address. That is an identity limitation, not proof that the clients avoided Pi-hole.
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Leases and names can mislead
- A DHCP lease may be old after a device changes networks or receives a new address.
- Randomized Wi-Fi MAC addresses can make one physical device appear as multiple clients.
- A hostname supplied by a device is not an authenticated identity; verify it against the router’s lease and the test interface.
- Guest, mesh, and VLAN networks may use separate DHCP scopes, so check the scope serving the tested device.
Check secure DNS and application-level resolvers
Ordinary DNS tests cover requests sent to configured resolver addresses. They do not cover every application that opens its own encrypted resolver connection. DNS-over-HTTPS carries the DNS lookup inside HTTPS, so the request may not produce the ordinary query Pi-hole expects to see.
Inspect the likely sources
- Web browsers: check the browser’s secure-DNS or “use secure DNS” setting and any enterprise policy controlling it.
- Operating systems: review private or encrypted DNS settings in the network profile.
- VPN software: determine whether the VPN installs a resolver, captures DNS before it leaves the device, or sends all traffic through a remote gateway.
- Individual applications: privacy, security, and media apps may contain a resolver setting independent of the operating system.
Disable or account for these mechanisms during a controlled test, then repeat the lookup. A missing ordinary DNS entry while an application is using DoH is expected behavior, not a failure of the Query Log.
Pi-hole special-domain controls
Pi-hole FTL documents policy handling for several discovery and opt-out mechanisms: Firefox’s use-application-dns.net canary, Apple iCloud Private Relay domains mask.icloud.com and mask-h2.icloud.com, and resolver.arpa for Discovery of Designated Resolvers. These controls influence client behavior; they do not replace testing the client and router path. Names, defaults, and available settings are release-specific, so compare them with the FTL configuration for the Pi-hole version installed on the network before changing a policy.
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Inspect the router’s DNS path
Routers commonly distribute DNS through DHCP, IPv6 router advertisements, or DHCPv6. Confirm that each relevant mechanism advertises the Pi-hole address. A router can advertise Pi-hole for IPv4 while advertising itself or another resolver over IPv6, creating a split path.
Also determine whether the router is acting as a DNS proxy. If clients are told to use the router, the router may forward their requests to Pi-hole while presenting its own address to Pi-hole. That arrangement can preserve filtering but reduce per-device visibility. Conversely, a router may forward to an upstream resolver other than Pi-hole, which is a genuine alternate path.
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Router settings to verify
- DHCP-provided IPv4 DNS server.
- IPv6 DNS information in router advertisements and DHCPv6.
- Whether “DNS proxy,” “DNS relay,” or a similar feature is enabled.
- VPN profiles, guest-network policies, and parental-control rules that alter DNS routing.
- Static DNS settings configured on the router itself.
Menu labels and behavior differ by model and firmware. Treat Fritz!Box instructions as an example of one vendor’s arrangement, not as a universal path.
Compare the diagnostic methods
| Method | What it reveals | What it cannot prove alone | Requirements |
|---|---|---|---|
| Client DNS settings plus direct query | Resolver addresses configured on that client and whether each responds to a specific lookup. | Application-level DoH or another resolver that is not exposed in the normal adapter settings. | Access to the active interface and commands such as dig or nslookup; test both address families. |
| Pi-hole Query Log | Whether a particular ordinary DNS lookup reached Pi-hole and which source address Pi-hole observed. | That an absent query was intentionally bypassed, or which device originated a router-proxied request. | A precise test domain and time; understanding of the source-address path. |
| Router DHCP or device list | Maps an IP or MAC address to a lease and usually to a local device label. | That the device used DNS through Pi-hole, or that a stale label is accurate. | Access to the relevant LAN, guest, or VLAN lease table. |
| Router DNS-enforcement rule | Can stop covered clients from reaching outside DNS servers over the protocols and ports the rule handles. | Encrypted DNS over permitted HTTPS, traffic outside the rule’s scope, or compatibility with every hard-coded resolver. | A router feature that supports the rule and a rollback plan. |
What to do after you confirm an alternate path
Detection and enforcement are separate decisions. First make sure the alternate path is real and identify the device or application. Then choose whether to block it, reconfigure it, or leave it outside Pi-hole intentionally.
Configure DHCP to advertise Pi-hole
Pi-hole’s post-install guidance recommends setting the router’s DHCP clients to use Pi-hole. Renew the client lease or reconnect the interface after changing the setting, then repeat the controlled lookup. If the router cannot advertise a custom DNS server, Pi-hole can provide DHCP instead: disable the router’s DHCP service, enable Pi-hole’s DHCP service, and ensure that only one DHCP server is active on the LAN. A manually configured client is a last resort because it is easy to overlook when addresses or networks change.
Block direct DNS at the router
A router-level rule can prevent clients from reaching public DNS servers directly. The documented Fritz!Box example tests a direct request such as:
dig google.com @8.8.8.8 +shortThe intended result is that the Pi-hole host can make the request through the allowed path while another client’s direct request is blocked. This is a vendor-specific example; other routers may use different filters, and some cannot apply them per device or network.
Test both allowed and blocked paths after applying a rule. Check UDP and TCP DNS behavior where the router supports separate handling, and do not assume a rule for traditional DNS also covers DoH. Keep an administrative recovery path so a mistaken rule does not strand the network.
Account for hard-coded resolvers
Some devices and applications ignore the resolver supplied by DHCP and contact a fixed server. Pi-hole’s Fritz!Box documentation warns: “Some devices or applications use hard-coded DNS servers and may not work as expected if they can’t reach the desired DNS server.” Blocking direct DNS can therefore improve policy compliance while breaking device functions that expect their chosen resolver. Record the affected device, test its required services, and create a narrowly scoped exception only if the behavior is understood.
Troubleshoot common ambiguous results
No Query Log entry, but the device appears to work
Check whether the answer was cached, whether the test actually ran on the intended interface, and whether a browser or application used DoH. Repeat with a distinctive domain and a fresh connection. Then inspect VPN and secure-DNS settings before changing router rules.
The Query Log shows the router, not the device
Use the router’s lease and connected-device list to map the test time and source address. If all clients are represented by the router, treat Pi-hole’s source field as a forwarding indicator, not a device identity. Enable local reverse or conditional forwarding only after confirming which system owns DHCP.
IPv4 is filtered but IPv6 is not
Compare the IPv6 resolver advertised by router advertisements or DHCPv6 with the Pi-hole IPv6 address. Test an AAAA lookup directly against every IPv6 resolver. Correct the IPv6 advertisement or disable IPv6 only if that is an intentional, documented network decision.
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Failure can be the desired block, but it can also be a broken route or an overly broad rule. Verify that a normal client lookup succeeds through Pi-hole, then test the direct resolver from the same client and network. Check whether a hard-coded application has stopped working before declaring the rule successful.
The result changes between networks
Repeat the inspection on wired, wireless, guest, mesh, and VPN networks separately. Each can distribute different DNS settings or use a different router path. A device that is compliant on the main LAN can bypass filtering after joining a guest SSID or starting a VPN.
A repeatable checklist
- Select one device and one distinctive or known-blocked test domain.
- Note the time, network, interface, and expected Pi-hole policy result.
- Open Pi-hole’s Query Log and record any matching entry and source address.
- Run
nmcli device show <interface> | grep .DNSon Linux oripconfig /allon Windows. - Record every IPv4 and IPv6 resolver shown for the active path.
- Query each address with
digornslookup, using both A and AAAA where relevant. - Compare each answer and timestamp with the Pi-hole log.
- Map Pi-hole’s source address to the router’s DHCP lease or connected-device record.
- Check VPN, browser, operating-system, and application secure-DNS settings.
- Review router DHCP, router-advertisement, DHCPv6, proxy, and guest-network DNS behavior.
- If an alternate path is confirmed, decide whether to reconfigure it, enforce DNS at the router, or leave it intentionally allowed.
- Repeat the test after every configuration change and document the result.
How to state the finding accurately
A strong finding identifies the device, interface, resolver, test name, time, and evidence. For example: “At 14:05 UTC, the wireless client received resolver address X, answered the test directly through X, and no matching query appeared in Pi-hole; the router lease maps X’s client address to the living-room tablet.” That is materially stronger than “the tablet bypasses Pi-hole” based only on a missing hostname.
If the request appears in Pi-hole but the source is the router, state that the lookup was observed through a router-forwarded path and that per-device attribution is unavailable from Pi-hole alone. If no ordinary query appears but secure DNS is enabled, state that the test did not traverse Pi-hole’s normal DNS logging path; do not claim that every lookup from the application bypasses filtering without testing the application’s actual connection.
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