Browser history is not saved in incognito mode in the browser used. However, this does not mean that it is impossible to track what you've done in incognito mode: If you use a computer running Windows, for example, your DNS queries will continue to be saved. DNS servers record the IP address and its hostname. Every time you type the name of a website into your browser, the browser will check the DNS server and retrieve the IP address of the website to open it. This leaves a record of all DNS requests and thus all web pages visited on your operating system.