.yu

.yu was the Internet country code top-level domain (ccTLD) that was assigned to Yugoslavia and was mainly used by the Federal Republic of Yugoslavia and its successor Serbia and Montenegro between 1994 and 2010. After Serbia and Montenegro acquired separate .rs and .me domains in 2007, a transition period started, and the .yu domain finally expired on 30 March 2010. It was the most heavily used top-level domain ever to be deleted.