The fact he's living like 10,000 miles from you means he can't do anything physically (unless he's one persistant sone of a ***** who would travel around the globe to swoop you with a golf club over such a trivial thing) at most he can do with an Ip address is gain public information, such as phone numbers, address, the other websties you browse, or DDos you (which means sending extra packets to slow down your net to the point it stops working/connecting) the most deadly thing he can do (well if he has gained access to your address) is swatting. Meaning he can false call your local police department with some bullshit like "dis guy twaking hoostages Lawl" and they come swooping at your house with m16's. And No, this is not a joke.