The Free license switches the VMware vSphere API into a Read-Only state. Third-party backup utilities that rely on Changed Block Tracking (CBT) or automated snapshot APIs (such as Veeam Backup & Replication) will fail to back up workloads on a free host.
A VMware ESXi 5.5 license key is a unique alphanumeric code that activates the full features of the ESXi 5.5 hypervisor. The license key is used to unlock the complete functionality of ESXi, allowing users to take advantage of advanced features such as:
The most significant "feature" of the ESXi 5.5 license was the for the free version. Prior to this 2013 release, free-tier users were capped at 32GB, which severely limited home labs and small business servers.
: Because it no longer receives security patches or bug fixes, running ESXi 5.5 in a production environment is highly discouraged as it contains unpatched vulnerabilities. How to Manage Licensing for Legacy Systems
Disclaimer: This article provides information based on legacy data and historical usage of VMware software. Always refer to official Broadcom documentation for current licensing policies. If you'd like, I can provide: license key vmware esxi 5.5
VMware originally offered a free version of ESXi 5.5, but it required a unique key obtained through a Broadcom/VMware account.
Equivalent to the vSphere Enterprise Plus tier (all features fully operational).
In ESXi 5.5, VMware removed the physical RAM limitation (which was 32 GB in version 5.0), allowing the free license to run on hosts with unlimited physical memory. However, it capped virtual CPUs (vCPUs) at 8 per virtual machine.
If you are managing an orphaned ESXi 5.5 host, you should map out an upgrade path to a supported platform (such as vSphere 7.0 or 8.0) using a multi-step upgrade pipeline: The Free license switches the VMware vSphere API
If you are running ESXi 5.5 for historical application compatibility, ensure the host is entirely isolated from the internet and placed behind strict internal firewalls.
Earlier free versions were limited to 8 physical cores per host, though some 5.5 versions lifted this, making it more flexible.
VMware ESXi 5.5 utilizes a 25-character alphanumeric license key. This key unlocks specific compute resources, memory allocations, and management features. Unlike modern subscription models that validate compliance via cloud-connected endpoints, ESXi 5.5 operates on an honor-system perpetual enforcement model. The hypervisor decodes the features locally once you input the key into the host configuration interface.
Select the ESXi host in the inventory panel. The license key is used to unlock the
VMware provides a for ESXi 5.5, often branded as the vSphere Hypervisor. This is a perpetual license, meaning it does not expire. Best for: Home labs, small, single-host environments.
ESXi 5.5 marked the absolute removal of the legacy Service Console (ESX), completing VMware's shift to a pure, thin-hypervisor architecture. This architectural change drastically reduced the hypervisor footprint to less than 150 MB, enhancing security by minimizing the attack surface and decreasing the frequency of required security patches. Core Enhancements over Previous Versions
: If you previously registered for ESXi 5.5, your key might still be visible in your historical "My VMware" or "Broadcom" download history under the "License & Download" tab. ⚙️ How to Apply a Key
Click , select the corresponding key from the repository, and click OK . Command-Line Configuration and Troubleshooting
Do you need to from a running host, or are you looking to upgrade to a newer version ?