Hi, I work for Tiscali's parent company, TalkTalk. The easiest way to acquire a MAC from Tiscali would be to contact our cancellation department who will then email you the MAC. Be advised though that if you are on an LLU package (where we own the cabinet in the telephone exchange) then a MAC doesn't exist and you'll need to contact BT or the telephone provider of your choice to port over your telephone number.