It's like hunting: You just have to wait to get a clean shot.
IPs like that of yours will have a lot of clients. Each time a user logs in the DHCP server will give him an unique IP, but only for the time he is logged in the system and a few seconds after.
So, if you have two users with one IP online at the same time, one of them is a fake user, but if you have some minutes or hours in between you can't be sure of anything.
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