An ESXi key is a 25-character code used to unlock and activate the full features of the VMware ESXi hypervisor. The key is required to enable advanced features, such as vMotion, Storage vMotion, and high availability.
: For home lab users who want "Enterprise Plus" features at a lower cost, the VMUG Advantage program provides 365-day evaluation keys for nearly all VMware products. VMware Licensing Transition to Broadcom esxi keys
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– You can get one from VMware’s site (requires registration). It never expires but is limited to 8 vCPUs per VM and no vCenter. An ESXi key is a 25-character code used