dnscontrol/documentation/language-reference/domain-modifiers/SVCB.md

name	parameters	parameter_types
SVCB	name priority target params modifiers...	name priority target params modifiers... string number string string RecordModifier[]

SVCB adds an SVCB record to a domain. The name should be the relative label for the record. Use @ for the domain apex.

The priority must be a positive number, the address should be an ip address, either a string, or a numeric value obtained via IP.

The params may be configured to specify the alpn, ipv4hint, ipv6hint, ech or port setting. Several params may be joined by a space. Not existing params may be specified as an empty string ""

Modifiers can be any number of record modifiers or JSON objects, which will be merged into the record's metadata.

{% code title="dnsconfig.js" %}

D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
  SVCB("@", 1, ".", "ipv4hint=123.123.123.123 alpn=h3,h2 port=443"),
);

{% endcode %}