Duck DNS is a free service which will point a DNS (sub domains of to an IP of your choice. This add-on includes support for Let’s Encrypt and will automatically create and renew your certificates.

  "lets_encrypt": {
    "accept_terms": true
  "token": "sdfj-2131023-dslfjsd-12321",
  "domains": [""]

Configuration variables:

  • token (Required): Your Duck DNS API key.
  • domains (Required): A list of domains to update DNS.
  • seconds (Optional): Seconds between updates to Duck DNS.
  • lets_encrypt.accept_terms (Optional): If you accept the Let’s Encrypt Subscriber Agreement, it will generate & update Let’s Enrypt certificates for your DuckDNS domain.

Home Assistant configuration

Use the following configuration in Home Assistant to use the generated certificate:

  ssl_certificate: /ssl/fullchain.pem
  ssl_key: /ssl/privkey.pem

If you use a port other than 8123 or an SSL proxy, change the port number accordingly.

Router configuration

You’ll need to forward the port you listed in your configuration (8123 in the example above) on your router to your Home Assistant system. You can find guides on how to do this on Port Forward - noting that you’ll only need to forward the TCP port.