That being said, here are some possible scenarios where you might find a free Nessus Professional activation code:

"I’m in," Leo whispered, a smirk spreading across his face. He launched the scan against his client’s network. The progress bar crawled forward: 10%... 45%... 80%.

: Verified students and instructors can get a free one-year license for Nessus Essentials Plus for coursework. Comparison of Versions Nessus Essentials (Free) Nessus Professional (Paid) ~$4,390/year Fully customizable Compliance Checks Not included Included (PCI, CIS, NIST) Community forums Professional support How to Use Your Code Tenable and Nessus Pricing & Purchase Options

: This is the official free version of Nessus. It allows you to scan up to 16 IP addresses. You can get a free activation code by registering on the Tenable Nessus Essentials page .

: Includes high-speed discovery, configuration auditing, and asset profiling. How to get it : Register on the Tenable Nessus Essentials page with a valid email to receive a free activation code. 2. Nessus Professional Free Trial