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If your phones are filtered on mobile data and other Wi‑Fi networks but show ads on your own home Wi‑Fi, the phones are probably taking a different DNS path at home. The usual causes are a router advertising another resolver, a secondary or IPv6 DNS server, or encrypted DNS that bypasses the network blocker. Check the blocker’s query log while loading a known test page: if the phone never appears, it bypassed the blocker; if it appears and the request is allowed, the blocker received it but did not block it.
What the home-only failure means
A network-wide blocker works only when a device sends its DNS queries to that blocker. At home, the router normally supplies DNS settings through DHCP. If the router gives clients an unfiltered resolver, or advertises another resolver over IPv6, a phone can ignore the blocker even though the same phone is filtered elsewhere.
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Encrypted DNS creates another bypass. Android’s Private DNS, an iPhone configuration profile, a browser’s Secure DNS setting, or a similar encrypted resolver can send lookups directly to an outside service. The local blocker never sees those queries, so its filtering rules and logs cannot affect them.
Use the query log to identify the failure
- Open the query log in your blocker, such as AdGuard Home or Pi-hole.
- On each phone, load a page that normally generates a recognizable advertising or tracking request.
- Look for the phone’s client entry and the domain requested at that time.
- No entry for the phone: the phone is using another DNS path. Investigate router DHCP, IPv6, Private DNS, profiles, and browser Secure DNS.
- An entry appears and is allowed: the blocker received the request. Check enabled blocklists, allowlists, rewrites, and custom rules.
- An entry is blocked but an advert remains: the remaining advert may use a domain shared with the page content, which DNS filtering cannot safely block.
AdGuard Home’s troubleshooting guidance starts with confirming that the device uses AdGuard Home as its default DNS and checking whether requests appear in the query log.
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Fix the home DNS path
Set the blocker as the router’s DNS server
In the router’s administration interface, open the LAN, DHCP, or local-network DNS settings and enter the blocker’s LAN address as the DNS server. Save the change, then reconnect each phone to Wi‑Fi or renew its network lease so it receives the new setting. Router-based DNS is the normal way to cover every device on the home network.
Do not enter the blocker only as a preferred server while leaving an unfiltered secondary server available unless you understand the router’s behavior. Some clients can use either advertised server, allowing requests to escape the filter.
Account for routers that cannot advertise custom DNS
If the router firmware will not accept a local DNS address, use the blocker’s DHCP service instead. AdGuard Home documents this approach, and Pi-hole supports its own built-in DHCP server. First disable DHCP on the router; then enable DHCP in the blocker and define the network range, gateway, and lease settings. Running two DHCP servers on one LAN can produce inconsistent assignments and intermittent failures.
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Check IPv6 DNS advertisements
A phone may receive the intended IPv4 DNS server but obtain a different resolver through IPv6 router advertisements or DHCPv6. Review the router’s IPv6 DNS settings and either advertise the blocker’s IPv6 address or disable IPv6 DNS advertising while you configure it. Test again with the query log; changing only the IPv4 setting may leave the bypass intact.
Remove per-device encrypted-DNS bypasses
On Android, review the Private DNS setting and remove or change any hostname that points to an external resolver. On iOS, inspect installed configuration profiles and DNS-related settings. In each browser, review Secure DNS or Use secure DNS; a browser-level choice can bypass the operating system and router settings for web traffic. Menu names and locations vary by operating-system version, browser, and manufacturer, so use the exact labels shown on the device.
After changing a setting, toggle Wi‑Fi off and on, restart the browser, and repeat the query-log test. Test every browser used on the phone: disabling Private DNS does not automatically disable a browser’s own encrypted-DNS feature.
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Router DNS versus per-device DNS
| Deployment | Coverage | Bypass resistance | Operational effort | Failure visibility |
|---|---|---|---|---|
| Router DHCP/DNS | All clients receiving the home network settings | Protects plain DNS; encrypted-DNS and IPv6 paths still require control | One router or DHCP change | Central blocker query log |
| Per-device configuration | Only selected phones or computers | Can address device-specific encrypted-DNS settings | Repeat settings on every device and browser | Device-local diagnostics plus any blocker logs |
Router deployment is usually the simplest baseline. Per-device settings are useful when the router cannot provide custom DNS, when only some clients should be filtered, or when you need to control encrypted DNS individually.
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When the blocker is working but ads remain
DNS filtering blocks name lookups, not content inside an already requested connection. AdGuard states: “Essentially, any advertising that shares a domain with content cannot be blocked by a DNS-level blocker.” If the phone’s requests are visible in the log and the relevant domains are blocked, remaining adverts may require browser-side filtering or another control that can distinguish page content from advertising; changing router DNS will not solve that specific limitation.
Quick Recap
Final verification checklist
- The router’s DHCP/DNS fields point to the blocker’s LAN address.
- No unfiltered secondary DNS server is advertised.
- IPv6 DNS advertisements point to the blocker or are intentionally disabled.
- Android Private DNS, iOS profiles, and browser Secure DNS are reviewed.
- Each phone appears in the blocker’s query log during a controlled test.
- Blocklists, allowlists, rewrites, and custom rules match the result shown in the log.
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