Festive offer available only for 24 hours: Failover IPv4 address with 36 % discount in unlimited quantities. Additionally, the setup fee is 75 % off, only today – Grab it now.
If one of your root servers/vServers/storages is unavailable, e.g. because you need to update the software on it, another root server/vServer/storage can take over the failover IPv4 address in order to continue offering the services behind the IP address.