These are cloud-based or on-prem enterprise platforms that aggregate multiple Nessus scanners. These require subscription-based licensing, not a simple activation key.
| Feature | Nessus Essentials (Free) | Nessus Professional (Licensed) | | :--- | :--- | :--- | | | 16 IP addresses per scan | Unlimited | | License Key | Free, registered via email | Paid, annual subscription | | Compliance Scanning | No (e.g., DISA STIG, CIS) | Yes | | API Access | No | Yes | | Cloud Scanning | Limited | Full (AWS, Azure, GCP) | | Use Case | Home labs, learning | Professional pentesting, enterprise | nessus professional license key
When a user purchases Nessus Professional, they receive a unique license key—a string of alphanumeric characters. This key acts as the authentication mechanism that unlocks the full potential of the Nessus scanning engine. These are cloud-based or on-prem enterprise platforms that