Old Editors, New Accounts

I agree with Drdee that it is impossible to tell that a user has forgotten his password and created a new one, based on IP addresses.

One user may work on different IP addresses for multiple reasons. On different places: on his home computer, at work, at a public place, at his friends PC etc. IP addresses may change over time: the user moves, installs a new hardware, switches from provider etc. IP addresses may be different from day to day: a particular PC in a public library, the provider assign a randum number in a range etc.

One IP address can be used by different users for the same reasons. So it is impossible to tell if a new userid on a certain IP address is the same person as before.

Thank you for your very helpful explanation. I really appreciate it (Drdee did not explain it extremely well).