 Ustorf earned 128 caps for the German national team, competed in four Olympic Games (1994, 1998, 2002, 2006), six World Championships and the 1996 World Cup of Hockey.On May 10, 2014, he was named Director of Sport at Eisbären Berlin and moved to Head of Player Development in May 2017.He parted ways with the Eisbären organization in December 2019.