Not sure if they are the top but university of miami went undefeated many, many times...id go with them
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Since 1966, the Dallas Cowboys have appeared in the playoffs 30 times.
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The Cowboys have been in the playoffs 29 times since they became an NFL team in 1960.
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Since 1968 was the last time they were undefeated in their division
As of January 2014, the Dallas Cowboys have been to the postseason 30 times, and played in 55 postseason games. They have won 33/55 games.
The Dallas Cowboys have been to the super bowl 8 times and have won 5 times. Most recently going 3 times and winning all 3 in the 1990's.
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once