Private IP addresses

Private IP addresses support IPv4 and IPv6 as well, but support for IPv6 is limited. They can only be assigned dynamically, and IPv6 addresses cannot communicate with each other inside a VNet. The only way to use IPv6 addresses is by assigning them to an internet-facing load balancer, where the frontend IP address is an IPv4 address and the backend is an IPV6 address.

Private IP addresses are typically used for VMs, internal load balancers, and application gateways. Because of the fact that a VPN is always internet-facing, it cannot have a private IP address. You can have a maximum of 4,096 private IP addresses per VNet. However, you can create multiple VNets (with a maximum amount of 50 VNets per subscription).

These limits are based on the default limits from the following page: https://docs.microsoft.com/en-us/azure/azure-subscription-service-limits?toc=%2fazure%2fvirtual-network%2ftoc.json#networking-limits. You can open a support request to raise these limits.

Now that we have some background information about the various networking aspects in Azure, we can configure a virtual network with a subnet.

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Private IP addresses