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

name	parameters	parameter_types
NAMESERVER_TTL	ttl	ttl target modifiers... Duration string RecordModifier[]

NAMESERVER_TTL sets the TTL on the domain apex NS RRs defined by NAMESERVER.

The value can be an integer or a string. See TTL for examples.

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

D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
  NAMESERVER_TTL("2d"),
  NAMESERVER("ns"),
);

{% endcode %}

Use NAMESERVER_TTL("3600"), or NAMESERVER_TTL("1h"), for a 1h default TTL for all subsequent NS entries:

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

D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
  DefaultTTL("4h"),
  NAMESERVER_TTL("3600"),
  NAMESERVER("ns1.provider.com."), //inherits NAMESERVER_TTL
  NAMESERVER("ns2.provider.com."), //inherits NAMESERVER_TTL
  A("@","1.2.3.4"), // inherits DefaultTTL
  A("foo", "2.3.4.5", TTL(600)), // overrides DefaultTTL for this record only
);

{% endcode %}

To apply a default TTL to all other record types, see DefaultTTL