Standard

Standard SKU public IP addresses:

  • Always use static allocation method.
  • Have an adjustable inbound originated flow idle timeout of 4-30 minutes, with a default of 4 minutes, and fixed outbound originated flow idle timeout of 4 minutes.
  • Secure by default and closed to inbound traffic. Allow list inbound traffic with a network security group.
  • Assigned to network interfaces, standard public load balancers, or Application Gateways. (NO VPN GATEWAYS)
  • Can be zone-redundant or zonal (can be created zonal and guaranteed in a specific availability zone).

Basic SKU

Basic SKU addresses:

  • Assigned with the static or dynamic allocation method.
  • Have an adjustable inbound originated flow idle timeout of 4-30 minutes, with a default of 4 minutes, and fixed outbound originated flow idle timeout of 4 minutes.
  • Are open by default. Network security groups are recommended but optional for restricting inbound or outbound traffic.
  • Assigned to any Azure resource that can be assigned a public IP address, such as:
    • Network interfaces
    • VPN Gateways
    • Application Gateways
    • Public load balancers

Allocation method

Basic and standard public IPs support static assignment. The resource is assigned an IP address at the time it’s created. The IP address is released when the resource is deleted.

Basic SKU public IP addresses support a dynamic assignment. Dynamic is the default assignment method. The IP address isn’t given to the resource at the time of creation when selecting dynamic.

The IP is assigned when you associate the public IP address resource with a:

  • Virtual machine
  • The first virtual machine is associated with the backend pool of a load balancer.

The IP address is released when you stop (or delete) the resource.

For example, a public IP resource is released from a resource named Resource A. Resource A receives a different IP on start-up if the public IP resource is reassigned.

The IP address is released when the allocation method is changed from static to dynamic. To ensure the IP address for the associated resource remains the same, set the allocation method explicitly to static. A static IP address is assigned immediately.

NOTE: A public IP’s SKU must match the SKU of the load balancer with which it is used

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