I own a site and I banned one of my users. His I.P was 68.111.xxx.xx Later, about 2 hours later, a new user registered. Looked suspicious, and I checked his I.P which was 68.191.xxx.xx
My question is, how can I essentially know if this is the same person, putting aside intuition?
So I used whatsmyip site and looked up both I.Ps. Both are from the US, but different places and providers. So he's not the same person? Or can there be other factors?