Cookie Policy
Effective Date: 7 May 2026 · Last Updated: 7 May 2026
This Cookie Policy explains how Subnet Calc Limited (“we”, “us”, “our”) uses cookies and similar technologies on the Subnet Calc service at www.subnetcalc.com (the “Service”).
Cookie consent on our Service is managed by CookieBot (Usercentrics A/S).
1. What Are Cookies?
Cookies are small text files placed on your device when you visit a website. They are widely used to make websites work, improve performance, and provide information to site owners.
2. Cookies We Use
2.1 Strictly Necessary Cookies
These cookies are essential for the Service to function. They cannot be disabled.
| Cookie | Provider | Purpose | Duration | Type |
|---|---|---|---|---|
session | subnetcalc.com | Authentication — contains an encrypted session token (JWT) that identifies your signed-in session. HttpOnly, Secure, SameSite=Lax. | 24 hours (standard) or 90 days (remember-me) | First-party |
CookieConsent | CookieBot | Stores your cookie consent preferences so the consent banner is not shown again. | 12 months | First-party |
Legal basis: These cookies are strictly necessary for the provision of the Service and do not require consent under the ePrivacy Directive (Article 5(3)) or equivalent legislation.
2.2 Performance / Analytics Cookies
These cookies help us understand how visitors interact with the Service by collecting information anonymously.
| Cookie | Provider | Purpose | Duration | Type |
|---|---|---|---|---|
ai_session | Microsoft Application Insights | Tracks user sessions for performance monitoring and error tracking. | Session | First-party |
ai_user | Microsoft Application Insights | Distinguishes unique users for analytics. Anonymised identifier. | 1 year | First-party |
Note: Analytics cookies are only set if you consent via the CookieBot banner. If you decline, no analytics cookies are placed and the Service continues to function normally.
Legal basis: Consent (GDPR Art. 6(1)(a), ePrivacy Directive Art. 5(3)).
2.3 Cookies We Do NOT Use
- Advertising / targeting cookies — we do not serve ads or track you for advertising purposes.
- Social media cookies — the Service does not embed social media widgets.
- Third-party tracking cookies — we do not allow third-party trackers on the Service.
3. Managing Your Cookie Preferences
3.1 CookieBot Consent Banner
When you first visit the Service, the CookieBot consent banner allows you to accept or decline optional cookies. You can change your preferences at any time by clicking the cookie icon in the bottom corner of any page.
3.2 Browser Settings
You can also control cookies through your browser settings. Most browsers allow you to:
- View what cookies are set
- Delete individual or all cookies
- Block cookies from specific or all sites
- Set preferences for first-party vs. third-party cookies
Note that blocking strictly necessary cookies will prevent you from signing in to the Service.
3.3 Do Not Track
We respect the “Do Not Track” (DNT) browser signal. When DNT is enabled, we do not set optional analytics cookies regardless of your CookieBot consent preference.
4. Cookie Consent Records
CookieBot maintains a record of your consent decision including:
- A consent ID (anonymous)
- Timestamp of consent
- Categories consented to
- Your anonymised IP address
These records are stored by CookieBot (Usercentrics A/S) in the European Union and retained for the duration required by applicable law (typically 5 years for GDPR consent documentation).
5. Updates to This Policy
We may update this Cookie Policy when we add or remove cookies. The “Last Updated” date at the top indicates when this policy was last revised. CookieBot automatically scans the Service periodically to detect cookie changes.
6. Contact
For questions about our use of cookies, submit an enquiry via our support page.
Subnet Calc Limited
Unit 34, 53 Mowbray Street, Sheffield, S3 8EN