vCenter Server systems are licensed with vCenter Server license keys that have per-instance capacity.

To license a single vCenter Server, you need a vCenter Server license key with a capacity for one instance. If you have vCenter Server systems in a Linked Mode group, you can purchase a vCenter Server license key with a larger capacity and assign the key to all vCenter Server systems in the group.

Note:

If you license vCenter Server 5.x with vCenter Server Standard or Foundation licenses, vCenter Server restricts managing hosts that are licensed with vSphere Essentials or Essentials Plus license keys.