Privacy Policy
Last updated: July 2026
1. Introduction
Welcome to CIDR Calculator ("we", "our", "us"). We are committed to protecting your privacy. This Privacy Policy explains how we collect, use, and safeguard information when you visit our website cidrcalculate.com and use our CIDR calculator, subnet calculator, IP calculator, and related networking tools.
2. Information We Collect
We do not collect any personal information. Our CIDR calculator, IPv6 calculator, VLSM calculator, and all other networking tools operate entirely in your browser. No IP addresses, subnet calculations, or network data you enter are transmitted to our servers.
We may collect anonymous, non-identifying information such as:
- Browser type and version
- Operating system
- Pages visited and time spent on our site
- Referring website addresses
3. How We Use Information
The anonymous information we collect is used solely to:
- Improve our online CIDR calculator and networking tools
- Analyze website traffic and usage patterns
- Optimize website performance and user experience
- Detect and prevent security threats
4. Cookies and Local Storage
Our website uses local storage to save your theme preferences (dark/light mode) and calculator settings. We do not use tracking cookies for our own purposes.
Google AdSense & Third-Party Cookies: We use Google AdSense to display advertisements. Google and its partners use cookies to serve ads based on your visits to our site and other websites. These cookies enable personalized advertising. You can opt out of personalized advertising by visiting Google Ads Settings or the AboutAds.info opt-out page.
5. Third-Party Services
We use the following third-party services:
- Google AdSense - For serving contextual and personalized advertisements. Google's use of advertising cookies is governed by Google's Privacy Policy.
- Google Analytics - For anonymous website traffic analysis.
- Microsoft Clarity - For anonymous user behavior analytics.
We do not sell, trade, or otherwise transfer your information to third parties.
6. Data Security
We implement appropriate security measures to protect the anonymous information we collect. Since our CIDR calculator, IPv6 calculator, and all networking tools process data entirely in your browser, your network calculations and IP addresses never leave your device.
7. Children's Privacy
Our services are not directed to individuals under the age of 13. We do not knowingly collect information from children under 13. If you are a parent or guardian and believe your child has provided us with information, please contact us immediately.
8. Changes to This Policy
We may update this Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page with an updated "Last updated" date. We encourage you to review this Privacy Policy periodically.
9. Contact Us
If you have any questions about this Privacy Policy, please visit our Contact Us page.