So to get this straight this is just hosted DNS? Like Route53? They aren’t a registrar or anything?

So you could pay for hosted DNS and then use them as the name server and other DNS records for multiple domains that you have?

It is like Route53. However, you cannot buy domain names from FreeDNS.

You can use FreeDNS as a name server and manage domain name records, like A records, cname, and MX records. You can have a dynamic domain name too.

You can also obtain free sub domain names from those who use FreeDNS as the name server and offer free sub domain names.