I purchased 3 new ip's for my dedicated server from Hetzner.
in WHM Documentation say: To add an IP address:
Enter the IP address into the Ip(s) to add field.
PICK Remember: You may use CIDR notation to add multiple addresses simultaneously.
Enter the subnet mask into the Subnet Mask field. If you are adding a single IP address, the subnet mask will be 255.255.255.0.
Click Submit to add the IP address(es).
You may click Reset to clear the Ip(s) to add and Subnet Mask fields.
But Hetzner in the mail that send me for each IP say:
Below you will find the additional single IP address added to your server EX40 #288958 (78.xx.xx.x).
Please note that you can only use the IP address for this server.