DNS in Tailscale

Tailscale provides each device on your Tailscale network (known as a tailnet) with a unique IP address that stays the same no matter where your devices are. However, IP addresses aren't very memorable, and can be unwieldy to work with. You can map Tailscale IP addresses to human-readable names using DNS.

Manage DNS in Tailscale

You can manage DNS for your tailnet using MagicDNS, your tailnet DNS settings, or public DNS records. You can also use the tailscale dns command.

MagicDNS

You can leverage Tailscale’s MagicDNS feature, which is enabled by default, to automatically assign DNS names for devices in your tailnet.

The MagicDNS setting determines whether your tailnet uses MagicDNS to automatically assign DNS names to devices in your tailnet. MagicDNS is optional and not required to use other DNS settings.

Read more about MagicDNS →

Tailscale DNS settings

You can manage the DNS settings for your tailnet from the DNS page of the admin console. This includes settings for MagicDNS, nameservers, and search domains.

Nameservers

Nameservers are the IPv4 or IPv6 addresses of the DNS servers you want devices to use when connected to your tailnet. You can use public nameservers or private name servers that include mappings for devices in your private network.

There are two types of nameservers: restricted nameservers and global nameservers.

Restricted nameservers

A restricted nameserver only applies to DNS queries matching a specific search domain. Using a restricted nameserver is also known as split DNS.

An example of a split DNS scenario would be if you configure 1.1.1.1 as a nameserver for the domain example.com. This tells devices in your tailnet to only use the 1.1.1.1 name server to look up DNS queries that match *.example.com (such as foo.example.com and bar.example.com).

Global nameservers

A global nameserver handles DNS queries for any domain. You can use a public DNS nameserver or run your own that to include additional DNS mappings.

When you use a public global nameserver, such as Cloudflare or Google, Tailscale automatically uses DNS-over-HTTPS (DoH) to ensure your DNS queries are encrypted before traversing the internet.

Some public global DNS nameservers include:

• Quad9: 9.9.9.9, 149.112.112.112, 2620:fe::fe, and 2620:fe::9.
• Google: 8.8.8.8, 8.8.4.4, 2001:4860:4860::8888, and 2001:4860:4860::8844.
• Cloudflare: 1.1.1.1, 1.0.0.1, 2606:4700:4700::1111, and 2606:4700:4700::1001.

You can also set a personalized DNS nameserver, such as NextDNS or Control D, as your global nameserver. These nameservers are available when you add a nameserver using the DNS page of the admin console.

Tailscale considers each global DNS nameserver's list of addresses as one entity. For example, if you add one of Google's nameservers, Tailscale automatically includes all of Google's nameserver addresses. This is true whether you add the addresses manually or through the DNS page of the admin console.

It’s best practice to use more than one global nameserver (which can be from the same provider) to ensure redundancy. However, keep in mind that using multiple global nameservers can bypass explicit content restrictions if they aren't the same across all the nameservers.

By default, your tailnet’s devices use their local DNS settings for all queries. To force clients to always use the nameservers you define, you can enable the Override local DNS toggle.

Search domains

Search domains provide a convenient way for users to access local network resources without having to specify the full domain path every time they connect to a resource. A user can specify a list of domain suffixes that are automatically appended to any domain name that is not a fully qualified domain name (FQDN).

For example, if a tailnet has example.com and test.com configured as search domains, and a user enters the phrase server, Tailscale uses the phrase to search for server.example.com against the tailnet's configured nameservers (such as 8.8.8.8 or 1.1.1.1). If no match is returned, it searches for server.test.com against the tailnet's configured nameservers.

• When MagicDNS is enabled, it is always the first domain in the Search Domains list. This is not configurable by a user.
• You can add, reorder, modify, and remove your search domains.

Public DNS records

If you prefer not to manage DNS settings through the admin console, you can instead publish records on your public-facing DNS server if you have one. The DNS names can be looked up (converted to a private IP address) by anyone on the internet, but because Tailscale IP addresses are only accessible to users of your network, this is relatively harmless.

Almost every organization already has a public DNS server for routing email and publishing a website, so this is easier than setting up an internal private DNS server.

Tailscale does not offer a DNS server, so you need to use one you run yourself or one offered by your cloud, domain host, or DNS provider.

Test DNS configurations

Traditionally, network admins use tools like nslookup to review DNS responses for various domains. However, on some platforms, nslookup doesn't use DNS information provided by the operating system, and returns incorrect results. You'll likely notice this issue when using split DNS or MagicDNS, which rely on advanced DNS features.

To test DNS settings on different platforms, Tailscale recommends the following approaches:

Override local DNS

By default, devices in your tailnet prefer their local DNS settings and only use the tailnet's DNS servers when needed. However, you might want to prevent devices in your tailnet from using their local DNS settings. For example, you might want to:

• Ensure devices have access to private DNS records.
• Prevent devices from using untrusted nameservers.
• Require all traffic to go through a specific DNS server that filters traffic.

Tailscale lets you force any device in your tailnet to use your tailnet DNS settings instead of its local DNS settings. To force tailnet devices to use the tailnet-defined DNS settings, enable Override local DNS. When enabled, devices connected to your tailnet ignore their local DNS settings and always use the global nameservers defined for the tailnet.

To enable overriding local DNS settings:

1. Go to the DNS page of the admin console.
2. Under Global nameservers, enable Override local DNS.

The order of DNS resolvers

You might expect to be able to give an operating system a list of DNS nameservers in order, and that operating system will try each of those nameservers in sequence to find a given domain.

However, as increasingly more systems and software applications require a connection to the internet to function, even small delays or rare hiccups in DNS lookup can result in a degraded user experience. In response, many modern operating systems have adopted more complicated rules for how to optimize response time when multiple DNS nameservers are available.

For example, operating systems might:

• Query nameservers in order, with small delays in between each attempt.
• Query all nameservers in parallel.
• Change the order of nameservers based on past performance.
• Change the order of nameservers based on known geographic proximity.
• Load balance queries between nameservers.

Because each operating system handles resolver ordering a little differently, Tailscale cannot guarantee that the DNS resolvers you add to the DNS page of the admin console will be queried in the exact order that you’ve specified. Depending on your DNS settings and your operating system, Tailscale either proxies all DNS requests (in which case Tailscale queries all nameservers in parallel and uses the quickest response) or defers to the operating system.

If you need nameservers to be in a specific order because you expect one of them (such as a private DNS service you run) to have different responses than the others. In that case, you’re probably better off using the split DNS feature or setting up conditional forwarding on your private DNS service and only using that resolver in your settings.