As of early 2026, obtaining a "new" free license key for version 5.5 is virtually impossible through official channels.
When applying a license key to ESXi 5.5, the process is straightforward. You typically connect to the host using the C# vSphere Client—the primary management tool for that era. Once logged in, you navigate to the Configuration tab, select Software, and then click on Licensed Features. From there, you can enter the 25-digit alphanumeric key. Once assigned, the "Evaluation Mode" notice, which usually lasts 60 days, will disappear, and the host will be permanently licensed under the free tier.
The free license is bound to a single physical server. If you move the host hardware (e.g., replace the NIC), you must re‑register the new MAC address to obtain a fresh key. esxi 5.5 license key free
If cost is your main concern and you need long-term free usage on older hardware, consider:
VMware ESXi 5.5 was once a popular enterprise hypervisor, but as of 2018, it has reached End of General Support (EOGS) and End of Technical Guidance (EOTG). Many users still search for "ESXi 5.5 license key free" hoping to run legacy environments or learn virtualization. This comprehensive guide explains legitimate licensing options, why free keys aren't legally available, and what you should use instead. As of early 2026, obtaining a "new" free
| Feature | Free ESXi 5.5 (vSphere Hypervisor) | Paid vSphere (Standard, Enterprise Plus, etc.) | |---------|-----------------------------------|---------------------------------------------------| | | No artificial caps (limited only by hardware) | Same, plus advanced resource pools | | vMotion (Live Migration) | Not available | Supported | | High Availability (HA) | Not available | Supported | | Distributed Resource Scheduler (DRS) | Not available | Supported | | Fault Tolerance | Not available | Supported (Enterprise Plus) | | vCenter Server Management | Cannot join a vCenter – managed only via local UI | Can be managed centrally by vCenter | | API Access & Automation | Limited; many SDKs return “not licensed” errors | Full API and CLI access (PowerCLI, REST) | | Backup & Replication | No integrated VMware Replication | Supported in higher editions | | Support | Community forums only; no official VMware Support | 24/7 support depending on contract | | Upgrade Path | Must upgrade to a newer free version (e.g., ESXi 8) manually | Can upgrade within a licensed suite |
This means that even if you possess a valid free license key, finding the installation ISO from a legitimate source is increasingly difficult. Furthermore, Broadcom has shifted focus toward subscription-based models, making the retrieval of legacy free keys problematic for new users. Once logged in, you navigate to the Configuration
Upgrade to ESXi 7.0 or 8.0 free edition, which runs well on most hardware from the last 5–7 years, and enjoy official security updates and community support.