The 1994 and 1995 Nebraska teams remain the only undefeated and untied back - to - back national champions since Oklahoma in 1955 and 1956 .
The 1994 and 1995 Nebraska teams went a combined 25 -- 0 .
The 1994 and 1995 Nebraska teams , which went a combined 25 -- 0 , remain the only undefeated and untied back - to - back national champions since Oklahoma in 1955 and 1956 .