This plugin will keep your hostname's IP address up-to-date. The plugin will periodically check your network's external IP address; if it sees that your IP address has changed, it updates the new IP address to your hostname.
Supported DNS Services:
If you want me to add support for other DNS service create a new issue.
Place the downloaded jar in your plugin folder and reload your server to generate the config file. After it's generated go to it and update the information, then restart the server.