Is there a unique identifier or strategy that can be applied to uniquely identify a user on the web?
I tried some strategies, like:
- Use external IP, but can be used by multiple users
- combine external IP and internal IP, but is a feature that is only available by WebRTC , which is not in most browsers (demo)
- identify using the MAC address but can not get it with JavaScript
- Use a LSO , but do you need Adobe Flash and who uses it in 2018?
Another point is that I need to identify them across domains. If I am in exemplo.com , sub.exemplo.com or exemplo2.com , I want this identifier to remain.
Sites that have Google Analytics have two cookies identified by _gid and _ga , but the value of those changes from domain to domain.