SOFTWARE LICENSE GUIDE
Nessus
Nessus is a popular vulnerability scanner used for security auditing. It offers a free limited version for non-commercial use and paid versions for commercial use.
What it does
Scans systems and networks to identify vulnerabilities, misconfigurations, and potential security threats.
Who it may suit
Security professionals, IT auditors, and system administrators for vulnerability assessment and compliance checks.
Free tier and license
Nessus Essentials is free for non-commercial use, limited to 16 IP addresses.
Limitations to check
Commercial use requires a paid subscription to Nessus Professional or Expert, which offer more features and higher IP limits.
Licensing notes
Proprietary subscription-based software. A free limited tier exists for non-commercial evaluation.
Verification details
Last licensing verification recorded: 2026-10-28.
Directory record last updated: 2026-08-27. These are separate dates: a record update does not necessarily mean the publisher's terms changed.
AI-assisted summaries may be incomplete or outdated. Confirm licensing, pricing, and commercial-use rights in the official sources before making a business decision.
Frequently asked questions
Is Nessus free?
Nessus Essentials is free for non-commercial use, supporting up to 16 IP addresses. Commercial use requires a paid subscription.
What is the difference between Nessus Essentials and Nessus Professional?
Nessus Essentials is for non-commercial use with a limit of 16 IPs. Nessus Professional is a paid product for commercial use with broader capabilities and higher limits.
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