An additional IP address becomes available only after you configure it. This guide will help you to configure IP addresses manually. If you want to configure it automatically, reinstall the operating system of your server.

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Configure an additional IP address on Debian/Ubuntu

1. Open the network configuration file in /etc/network/interfaces. 2. Add the following lines to the file: 
auto eth0:N  
iface eth0:N inet static  
                address Х. Х. Х. Х  
                netmask 255.255.255.255
Replace
  • N with the serial number of the interface (0 for the first one, 1 for the second, etc.)
  • Х.Х.Х.Х with the IP address you want to add
  • 255.255.255.255 with the net mask. You can find it in your Control Panel. Go to the Virtual private servers or Dedicated servers tab, choose the server you need, and click the IP addresses button.
Configure an additional IP address on CentOS
Configure an additional IP address on CentOS
If you need to add an IPv6 address, add the following: 
iface eth0:N inet6 static  
    address 2х01:Х:X:X::X
3. Save the file. 4. Reboot the server or run the “service network restart ” command.

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Configure an additional IP address on CentOS

1. Create the "ifcfg-eth0:N" file in the /etc/sysconfig/network-scripts/ directory. 2. Add the following lines to the file: 
DEVICE=eth0:N 
ONBOOT=yes 
BOOTPROTO=static 
IPADDR=X.X.X.X 
NETMASK=255.255.255.255
Replace “N” with the serial number of the interface (0 for the first one, 1 for the second, etc.), “Х.Х.Х.Х” with the IP address you want to add, and “255.255.255.255” with the netmask. You can find it in your Control Panel. Go to the Virtual private servers or Dedicated servers tab, choose the server you need, and click the IP addresses button.
Configure an additional IP address on CentOS
Configure an additional IP address on CentOS
If you need to add an IPv6 address, add the following: 
IPV6ADDR_SECONDARIES="2х01:Х:X:X::X/64"
Replace "2х01:Х:X:X::X/64" with the IP address you want to add. 3. Save the file. 4. Reboot the server or run the "service network restart" command.

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Configure an additional IP address on Windows Server 2012

1. Run the server via RDP. 2. Click Start and find Server Manager. 3. In the Server Manager window, click Local Server. 4. In the Server Configuration page, right-click the connection you want to configure and select Properties. 5. Choose IP Version: for IPv4, select Internet Protocol Version 4 (TCP/IPv4), and for IPv6, select Internet Protocol Version 6 (TCP/IPv6). 6. Click Advanced and then select Add to specify the IP address and the subnet mask. 7. Click Ok to save the changes, and then click Close.