there is nothing to do with the IP
and as u are using the same network for all ur PCs
maybe it's just a prank from a friend?
and it have entered all ur computers
like a simple virus
or a .BAT file (or what ever it is)
Locate your toribash directory and find the tb_login.dat file, if there is not one there, make one. After that, manually input the information like so: