Websites can recognize returning visitors in several ways. Cookies can store session or preference data, an IP address identifies the network path, browser fingerprinting combines device characteristics, and account logins directly connect activity to an account. These methods serve different purposes and can be combined, which is why clearing cookies or changing your IP does not erase every form of tracking.
Cookies: browser-stored state
A cookie is a small piece of data a site asks your browser to store and send back on later requests within its scope. Cookies can keep you signed in, remember preferences, support shopping carts, or be used in analytics and advertising. First-party cookies are associated with the site you visit; third-party cookie behavior is restricted by many browsers and privacy settings. Cookies can be temporary or persist until their expiration or deletion.
IP addresses: network-level information
A website usually sees the public IP that reaches its server. The address may indicate a provider and approximate region, but it generally does not identify a person’s name or exact street address by itself. Many people can share one public IP through a home router, carrier-grade NAT, workplace network, or VPN exit node. The address may change over time.
Browser fingerprinting and account identifiers
Fingerprinting combines browser and device characteristics to distinguish a browser. A login is more direct: when you sign in, the service knows which account is interacting with it. Purchase records, email addresses, device IDs, and app permissions can add more context. A service might use several signals together, but the exact practice depends on the site and its privacy policy.
What changing one signal does
- Clearing cookies may sign you out and remove some stored identifiers, but it does not necessarily remove server-side records or fingerprint signals.
- Using a VPN may change the public IP a site sees, but it will not stop account-based tracking or remove cookies.
- Private browsing limits some local history and storage after the session ends, but it does not make the session anonymous to websites.
- Blocking all cookies can break logins, preferences, and shopping carts; consider using the browser’s tracking protections and reviewing permissions instead.
A practical privacy routine
- Review tracking protection in your browser and keep it updated.
- Clear site data when troubleshooting a privacy or login issue, knowing you may be signed out.
- Limit third-party permissions and remove unnecessary extensions.
- Use separate browser profiles for genuinely separate contexts when helpful.
- Read the privacy controls of accounts and services you use frequently.
- Treat an IP lookup as a view of your network address, not a complete privacy score.
Common questions
Does a VPN stop cookies?
No. Cookies are stored by the browser, and many continue to work regardless of the public IP address.
Can two people have the same IP address?
Yes. Shared routers, mobile carriers, offices, and VPN exits often make multiple users appear behind one public address.
Is deleting cookies the same as deleting my account data?
No. It removes selected browser-stored data; information retained by a service is managed separately through that service’s settings and policies.
Related KiwiVPN guides
Read Browser fingerprinting without the myths, What a VPN changes, and HTTPS explained.
Further reading
Browse all KiwiVPN guides or return to the public IP checker.