sing-box/docs/configuration/dns/server.md

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### Structure
```json
{
"dns": {
"servers": [
{
"tag": "google",
"address": "tls://dns.google",
"address_resolver": "local",
"address_strategy": "prefer_ipv4",
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"strategy": "ipv4_only",
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"detour": "direct"
}
]
}
}
```
### Fields
#### tag
The tag of the dns server.
#### address
==Required==
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The address of the dns server.
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| Protocol | Format |
|-------------------------------------|-------------------------------|
| `System` | `local` |
| `TCP` | `tcp://1.0.0.1` |
| `UDP` | `8.8.8.8` `udp://8.8.4.4` |
| `TLS` | `tls://dns.google` |
| `HTTPS` | `https://1.1.1.1/dns-query` |
| `QUIC` | `quic://dns.adguard.com` |
| `HTTP3` | `h3://8.8.8.8/dns-query` |
| `RCode` | `rcode://refused` |
| `DHCP` | `dhcp://auto` or `dhcp://en0` |
| [FakeIP](/configuration/dns/fakeip) | `fakeip` |
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!!! warning ""
To ensure that system DNS is in effect, rather than Go's built-in default resolver, enable CGO at compile time.
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!!! warning ""
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QUIC and HTTP3 transport is not included by default, see [Installation](/#installation).
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!!! info ""
the RCode transport is often used to block queries. Use with rules and the `disable_cache` rule option.
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!!! warning ""
DHCP transport is not included by default, see [Installation](/#installation).
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| RCode | Description |
|-------------------|-----------------------|
| `success` | `No error` |
| `format_error` | `Format error` |
| `server_failure` | `Server failure` |
| `name_error` | `Non-existent domain` |
| `not_implemented` | `Not implemented` |
| `refused` | `Query refused` |
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#### address_resolver
==Required if address contains domain==
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Tag of a another server to resolve the domain name in the address.
#### address_strategy
The domain strategy for resolving the domain name in the address.
One of `prefer_ipv4` `prefer_ipv6` `ipv4_only` `ipv6_only`.
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`dns.strategy` will be used if empty.
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#### strategy
Default domain strategy for resolving the domain names.
One of `prefer_ipv4` `prefer_ipv6` `ipv4_only` `ipv6_only`.
Take no effect if override by other settings.
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#### detour
Tag of an outbound for connecting to the dns server.
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Default outbound will be used if empty.