I have a personal website on digitalocean that is assigned a public IP addr, say, 128.148.32.11. It is a static IP address. Is it possible to get a free domain for this IP address?
I do not care about the URL of the domain as long as it is free. Preferably, the domain remains free for a long time and one need to re-register every now and then.
One option is to use http://freedns.afraid.org/.
Register for a free account. Then, add a sub-domain (choose whatever suits you) and put your digitalocean IP address 128.148.32.11 into the Destination field.
You're ready to go.
You do not need to care about the dynamic DNS stuff because your digitalocean VM ip address is a static one. Makes things even simpler for you.