Terms & Conditions
Last updated: September 14, 2026 • Effective Date: January 1, 2026
1. Acceptance of Terms
By accessing or using SubnetCalculator.org (the "Website", "Service", or "We"), you acknowledge that you have read, understood, and agree to be bound by these Terms & Conditions, together with our Privacy Policy. If you do not agree to these terms, please discontinue using this Website immediately.
2. Description of Service & Free Access
SubnetCalculator.org provides online networking calculators, CIDR reference charts, subnet partitioning visualizers, and educational resources for systems administrators, network engineers, software developers, and students. The Service is provided free of charge for both personal and commercial operational planning.
3. Calculation Accuracy & "As-Is" Disclaimer
While we rigorously test all algorithms against official Internet Engineering Task Force (IETF) RFC specifications—including RFC 1519, RFC 1918, RFC 3021, RFC 4291, and RFC 4632—the tools and calculations on this website are provided on an "AS IS" and "AS AVAILABLE" basis without warranties of any kind, whether express or implied.
Network administrators, cloud engineers, and IT professionals are solely responsible for independently verifying all IP address allocations, router subnet masks, routing access control lists (ACLs), and firewall rules before deploying them to production hardware or live enterprise environments.
4. Limitation of Liability
To the fullest extent permitted by applicable law, SubnetCalculator.org, its creators, and affiliates shall not be liable for any direct, indirect, incidental, special, consequential, or punitive damages resulting from:
- Any errors, bugs, or inaccuracies in calculation outputs;
- Network downtime, IP address conflicts, or routing outages incurred in your infrastructure;
- Any unauthorized interruption, server downtime, or loss of access to our tools;
- Any reliance placed on reference tables, educational guides, or CIDR cheat sheets.
5. Intellectual Property & Acceptable Use
All website designs, layout code, branding, logos, custom algorithms, written tutorials, and documentation on SubnetCalculator.org are the proprietary intellectual property of SubnetCalculator.org unless otherwise specified.
You are granted a revocable, non-exclusive license to use the calculators and copy generated output data for your network designs. You agree NOT to:
- Systematically scrape, mirror, or republish the entire website interface without explicit written consent;
- Engage in denial-of-service attacks, automated spam, or actions that impair site availability for other users;
- Misrepresent our affiliation or attempt to frame the website to deceive third parties.
6. External Links & Third-Party Services
Our site may contain links to third-party references (such as official RFC documents, IANA registries, or external technical specifications). We have no control over the content, policies, or availability of third-party websites and assume no responsibility for them.
7. Modifications to Terms
We reserve the right to amend these Terms & Conditions at our sole discretion. Any updates will take effect immediately upon being posted on this page. Your continued use of the website following any changes signifies your acceptance of the revised terms.
8. Contact Information
For legal inquiries, copyright notices, or questions regarding these terms, please contact us via our Contact page or via email at legal@subnetcalculator.org.