This Android setting is overriding your router's private DNS
Even if you have a private DNS set on your router , your Android phone may not be using it. It all comes down to a single setting on your phone. While there isn't a perfect solution to this conflict, resolving it is relatively straightforward and will allow your phone and router to play nice with each other.
Setting private DNS on your phone will ignore your router's custom DNS
Can't have it both ways
DNS is the phonebook of the internet. It translates domain names we type into our browsers (such as howtogeek.com, for instance) into IP addresses that computers can understand.
By default, your router, and by extension all devices connected to your home network, use your ISP's default DNS resolver, which isn't encrypted in any way, and exposes your DNS queries to your ISP and anyone with access to your network. Many DNS servers provided by ISPs aren't very snappy, either. The same applies to your phone; when you're on mobile data, the phone uses your carrier's DNS server.
On the other hand, we have private DNS providers such as Cloudflare's 1.1.1.1 , Quad9 , and NextDNS , which not only encrypt DNS requests but are often faster at resolving them than those provided by ISPs and mobile carriers, making them a better choice not only from privacy and security perspectives, but also performance-wise.
This is why setting up private DNS on routers has become so popular. Not only are your connections more secure, but DNS requests are also often resolved faster, which can make websites load more quickly. Since the private DNS is set on your router, all devices on your network use the same DNS resolver, which simplifies things.
This also applies to your Android phone, but only if you don't have Private DNS enabled. You can access this setting by opening Settings and going to Network & internet > Private DNS on Pixel phones, or Settings > Connections > More connection settings > Private DNS on Samsung Galaxy phones. If you do use a private DNS provider on your Android phone, however, it will ignore your router's custom DNS settings.
Running a private DNS may cause network issues on your phone
Your router or a Wi-Fi network you're connected to might not play nice with your phone's private DNS
Lucas Gouveia/How-To Geek
In most cases, having different private DNS providers on your router and phone doesn't matter. Devices on your network that don't have one configured will use the router's DNS service, while your Android phone will use the one configured on the phone itself. However, this setup can cause certain issues.
For instance, if you use an advanced DNS service on your router, such as NextDNS, and have configured it to block certain websites or enforce safe search globally, you won't get those benefits on your phone if it uses a different DNS service.
If you're using Pi-hole , which acts as a network-level ad blocker, enabling Private DNS on your phone will bypass it. However, you can use Pi-hole with Android's Private DNS feature by setting up a DNS-over-TLS proxy that accepts requests on port 853 and forwards them to Pi-hole on port 53.
If your ISP or router blocks DNS-over-TLS traffic, it can prevent Android's Private DNS feature from working properly. This is because Android's Private DNS feature uses the DNS-over-TLS protocol, which relies on encrypted connections over port 853. So, if your router blocks port 853, it can prevent your phone from communicating with its private DNS provider, which can cause websites to stop loading. On the other hand, DNS-over-HTTPS routes DNS queries over port 443, which is also used for regular HTTPS traffic, making it much more difficult to block without affecting other web traffic.
The same can happen if you're using a router with a custom DNS service configured to prevent devices from bypassing its DNS filtering. For instance, NextDNS includes a setting called Block Bypass Methods that blocks known third-party DNS services and forces devices to use the router's DNS filter instead. As a result, Android phones with Private DNS enabled may be unable to use their configured DNS provider, which can cause connectivity issues.
Using private DNS on your phone can also cause issues on company and university Wi-Fi networks, because they often block DNS-over-TLS and enforce the use of their own DNS servers.
You can resolve the conflict
It's really simple
Goran Damnjanovic / How-To Geek
If you're experiencing problems, there are a number of potential solutions. None is perfect, but many work quite well.
The most straightforward solution is to disable Private DNS when your phone is connected to your home Wi-Fi. This can be annoying because you'll have to enable Private DNS every time you leave home or switch to mobile data, but there are apps that add a Private DNS toggle to Android's Quick Settings panel. All you have to do is grant a single permission via ADB (Android Debug Bridge) or Shizuku while configuring them.
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You can also use the same private DNS provider on both your phone and router. This way, you can enjoy the same benefits and avoid conflicts, especially if you're using a provider that allows advanced configuration, without having to disable Private DNS on your phone whenever you're connected to your home Wi-Fi.
If you run a custom DNS service on your router that blocks third-party DNS providers, you can usually resolve the issue by adding your Android phone's DNS provider (for example, dns.google if you use Google Public DNS) to the list of allowed domains.
Lastly, if your router or a Wi-Fi network you're connected to (at work or university, for instance) blocks DNS-over-TLS, or if you simply want to use system-wide DNS-over-HTTPS on your Android phone, you can use an app to do so. Some DNS providers, such as NextDNS, allow you to use DNS-over-HTTPS on Android, but only if you configure DNS through their apps.
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Private DNS is more complicated than it needs to be
In a perfect world, your phone would identify your router's private DNS the moment it connects to its Wi-Fi network and either disable its own Private DNS setting or automatically switch to your router's. But, as is often the case, things aren't that simple.
Fortunately, there are a number of ways to make your router and Android phone play nice with each other if they both use private DNS. You can even use private DNS on your phone if the network you're connected to blocks DNS-over-TLS. All it takes is a bit of tweaking or the use of a dedicated DNS app on your phone.
