Droplets do not have dedicated IP addresses, only leased ones.
When a user creates a new Droplet, we lease a static IP address for it from an available pool. This address remains associated with the Droplet until a user destroys the Droplet, at which point the address returns to the available pool.
In addition to the Droplet’s leased IP address, you can create a Reserved IP, which is a publicly-accessible static IP address that you can assign to a Droplet and then reassign to another Droplet later, as needed.