not likely that both of u are on the same world.. even if it is.. probably ur mask code is different.. not like from household where ip differ by a mere figure.. urs could have been more... example, router from household ip could be 62.100.323.85 and 62.100.323.86 For school lan, it might be 127.152.115.63 and 127.153.152.49 so i bet you are safe.. i did an ip mask detection during my college days via my school computer network.. tats what i get.. Bless u though.. my theory may or may not be the same..