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

Structure

{
  "dns": {
    "servers": [
      {
        "tag": "google",
        "address": "tls://dns.google",
        "address_resolver": "local",
        "address_strategy": "prefer_ipv4",
        "strategy": "ipv4_only",
        "detour": "direct"
      }
    ]
  }
}

Fields

tag

The tag of the dns server.

address

==Required==

The address of the dns server.

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

!!! warning ""

To ensure that system DNS is in effect, rather than go's built-in default resolver, enable CGO at compile time.

!!! warning ""

QUIC and HTTP3 transport is not included by default, see [Installation](/#installation).

!!! info ""

the RCode transport is often used to block queries. Use with rules and the `disable_cache` rule option.

RCode	Description
success	No error
format_error	Format error
server_failure	Server failure
name_error	Non-existent domain
not_implemented	Not implemented

address_resolver

==Required if address contains domain==

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.

dns.strategy will be used if empty.

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.

detour

Tag of an outbound for connecting to the dns server.

Default outbound will be used if empty.