Reserved IP Support

A DigitalOcean Reserved IP address is a publicly-accessible static IP address that you can assign to a Droplet and then reassign to another Droplet later, as needed. You can implement a failover mechanism with reserved IPs to build a high availability infrastructure.

Note
The Floating IP service is now called Reserved IPs. The Reserved IP service retains the same functionality as the prior service.

There is no possible way to convert a Droplet IP into a Reserved IP.
Reserved IPs do not support SMTP traffic.
You cannot retain a Droplet’s IPv4 when you transfer the Droplet to a new region. Use a reserved IP address to maintain a static IP address.
You cannot create Droplets with a specific IP address, but you can use reserved IPs for a static address that you can migrate between Droplets.
Droplets do not have a dedicated IP address.
Snapshots do not retain the IP address of the Droplet they were created from, but you can use reserved IPs to assign the same address to new or redeployed Droplets.