Among your tracked data, collected by the tracking pixel or trackable URL, you will see IP-addresses. But what exactly is an IP-address and why is it useful? According to Wikipedia it is “a numerical label assigned to each device connected to a computer network that uses the Internet Protocol for communication”.
We use the IP-addresses to determine whether you are tracking yourself and to determine location data. You can read more about this in How to prevent tracking yourself and How accurate is the location data?.