Overview

IONOS Cloud provides the customer with public IP addresses that, depending on the intended use, can be booked either permanently or for the duration for which a server exists. These IP addresses provided by IONOS Cloud are only needed if connections are to be established over the internet. Internally, VMs can be freely networked. For this, IONOS Cloud offers a DHCP server that allows assignment of IP addresses. However, one can establish one’s own addressing scheme. For more information, see Reserve an IPv4 Address.

Public IPv4 addresses

Every virtual network interface card that is connected to the internet is automatically assigned a public IPv4 address by DHCP. This IPv4 address may change when you deallocate your VM using Power Stop or by removing the network interface.

Customers can reserve static public IPv4 addresses for a fee. These reserved IPv4 addresses can be assigned to a virtual network interface card, which is connected to the internet, as primary or additional IP addresses.

Private IPv4 addresses

In networks that are not connected to the Internet, each virtual network interface card is automatically assigned a private IPv4 address. This is assigned by the DHCP service. These IPv4 addresses are assigned statically to the MAC addresses of the virtual network interface cards.

You can The use of the IP address assignment can be enabled or disabled for each network interface card. Any private IPv4 addresses pursuant to RFC 1918 can be used in private networks.

Note: When you create a Virtual Machine (VM) and associate a LAN with it:

• By default, each LAN you create in a VDC is assigned a private IPv4 CIDR block in the /24 subnet range.

• The VM is automatically assigned an IPv4 address from the range .10-.255 within the allocated subnet. These IP addresses are part of the same address ranges referenced in the table. You can know more about the allotted ranges using the DCD or using the Retrieve LANs API request. To view the information in the DCD, select the respective LAN in the Workspace, select the Members tab in the Inspector pane.

• IP addresses within each subnet range from .2-.9 are reserved for connecting to managed services, such as VPN gateways or DBaaS resources. Ensure you use addresses from this reserved range when configuring LAN connections for managed services to avoid conflicts with IPs assigned via DHCP.

Network address range	CIDR notation
10.0.0.0 to 10.255.255.255	10.0.0.0/8
172.16.0.0 to 172.31.255.255	172.16.0.0/12
192.168.0.0 to 192.168.255.255	192.168.0.0/16