How we collect, use, and protect your information.
We collect information you voluntarily provide, including:
When you use the Service, we automatically collect:
CIDR ranges, IP addresses, subnet designs, and similar inputs you enter into our calculators are processed entirely in your browser and are NOT transmitted to our servers or stored by us, unless you explicitly choose to save them to a logged-in account. We have no way to see what specific networks you calculate.
We use collected information to:
We use Google Analytics, a web analytics service provided by Google LLC ("Google"), to understand how visitors use our site. Google Analytics uses cookies and similar technologies to collect anonymized data about your visit, including pages viewed, time spent, traffic sources, and device characteristics.
This data is processed in aggregate form. Google may use this data to provide its own services. You can opt out of Google Analytics tracking by installing the Google Analytics Opt-out Browser Add-on.
More information: Google's Privacy Policy · How Google uses data
We use Google AdSense to display advertising on our Service. Google AdSense uses cookies, web beacons, and other technologies to:
Third-party vendors, including Google, use cookies to serve ads based on a user's prior visits to our website or other websites. Google's use of advertising cookies enables it and its partners to serve ads to our users based on their visit to our site and/or other sites on the internet.
You may opt out of personalized advertising by visiting Google Ads Settings or aboutads.info/choices.
More information: How Google uses information from partner sites
We also display advertising via Adsterra, an advertising network. Adsterra and its partners may use cookies, pixel tags, and other tracking technologies to:
Adsterra collects technical information such as IP address, browser type, operating system, and referring URLs. For more information, please review the Adsterra Privacy Policy. You can opt out of interest-based advertising via the Network Advertising Initiative (NAI) opt-out or the European Interactive Digital Advertising Alliance (EDAA).
We may also use:
We use the following categories of cookies:
Required for the Service to function. Includes the theme preference (light/dark) and (if you sign in) authentication tokens. These cannot be disabled.
Used by Google Analytics to understand site usage. These can be disabled via your browser settings or the Google Analytics opt-out.
Set by Google AdSense, Adsterra, and their partners to display personalized advertising. These can be controlled via the opt-out links in Section 3.
We implement Google Consent Mode v2 and a region-aware consent banner:
Region detection caveat: Timezone is an imperfect proxy. If you are travelling, using a VPN, or your device is misconfigured, your region may be detected incorrectly. To explicitly request a consent banner regardless of detected region, contact us via the contact page — we will honor manual opt-out requests from any user.
Consent expiration: Your consent choice is stored locally in your browser for 12 months. After that, the banner reappears so you can re-confirm. To change your choice sooner, clear your browser's site data for cidrcalculator.net and reload the page.
You can manage or block cookies through your browser settings. Note that disabling cookies may affect your experience.
If you are located in the European Economic Area, the United Kingdom, or California (or any other US state with applicable privacy law), you have the following rights:
To exercise any of these rights, contact us via the contact page. We will respond within the legally required timeframe (one month for GDPR; 45 days for CCPA).
We do not sell personal information. We share information only:
If you are in the EEA, you have the right to:
If you are a California resident, you have the right to:
To exercise any of these rights, email contactus@cidrcalculator.net with the subject line "Privacy Request." We will respond within 30 days.
We retain personal information only as long as necessary for the purposes outlined in this Policy:
We implement reasonable technical and organizational measures to protect your information:
However, no internet transmission or storage is 100% secure. We cannot guarantee absolute security. See our Security page for more detail.
The Service is not directed to children under 13 (or 16 in some jurisdictions). We do not knowingly collect personal information from children. If you believe we have collected information from a child, please contact us so we can delete it.
The Service is hosted on servers that may be located in the United States, Europe, or other jurisdictions. By using the Service, you consent to the transfer of your information to these locations. We rely on Standard Contractual Clauses and similar mechanisms for cross-border transfers as required by applicable law.
Some browsers offer a "Do Not Track" signal. Because no industry standard for honoring DNT signals has been adopted, we do not currently respond to DNT signals. You can control tracking via the third-party opt-outs and cookie controls described above.
We may update this Privacy Policy from time to time. Material changes will be posted on this page with a new "Last updated" date. We encourage you to review periodically.
For questions about this Privacy Policy or our data practices, contact:
cidrcalculator.net
Email: contactus@cidrcalculator.net
Subject: "Privacy Inquiry"