What are some alternatives?
When comparing Dynu Dynamic DNS and ClouDNS.net, you can also consider the following products
FreeDNS - Free DNS hosting, lets you fully manage your own domain. Dynamic DNS and Static DNS services available. You may also create hosts off other domains that we host upon the domain owners consent, we have several domains to choose from!
No-IP - Dynamic DNS and Managed DNS Provider
Dyn - Managed DNS, Outsourced DNS & Anycast DNS
Duck DNS - Free dynamic DNS hosted on Amazon VPC
NameCoin - Namecoin is a distributed domain name system based on the Bitcoin technology.
zzzz.io - Free dynamic DNS names for personal use - the perfect DynDNS replacement.