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In case you want to use your own domain for dynamic DNS, you need a DNS hosting provider (which can be different from your domain registrar) who exposes an API to update DNS entries. For example, I register my domains with Namecheap but use Cloudflare’s free DNS plan, which I find excellent. It’s highly customizable (in the sense that they don’t have weird, unnecessary limitations when it comes to creating records) and their API is super simple to use. It’s also supported directly inside pfSense (both IPv4 and IPv6).