---
name: DefaultTTL
parameters:
  - ttl
parameter_types:
  ttl: Duration
---

DefaultTTL sets the TTL for all subsequent records following it in a domain that do not explicitly set one with [`TTL`](../record/TTL.md). If neither `DefaultTTL` or `TTL` exist for a record,
the record will inherit the DNSControl global internal default of 300 seconds. See also [`DEFAULTS`](../global/DEFAULTS.md) to override the internal defaults.

NS records are currently a special case, and do not inherit from `DefaultTTL`. See [`NAMESERVER_TTL`](../domain/NAMESERVER_TTL.md) to set a default TTL for all NS records.


```javascript
D('example.com', REGISTRAR, DnsProvider('R53'),
  DefaultTTL("4h"),
  A('@','1.2.3.4'), // uses default
  A('foo', '2.3.4.5', TTL(600)) // overrides default
);
```

The DefaultTTL duration is the same format as [`TTL`](../record/TTL.md), an integer number of seconds
or a string with a unit such as `'4d'`.