Just a heads up, DynDNS hasn't been free for years. Even the most basic plan is way too expensive for what you get. If your DNS provider has a CLI just use tha

Just a heads up, DynDNS hasn't been free for years. Even the most basic plan is way too expensive for what you get. If your DNS provider has a CLI just use that. I use Route53 and a simple cronjob to update it.