[yvonne]

I was looking for a better source, but could find only Wikipedia, which cites NCAA rulebook section 4 article 1

http://en.wikipedia.org/wiki/Uniform_num..._football)

Backs 1-49 Snapper 50-59 Guard 60-69 Tackle 70-79 End 80-99
Otherwise all player must be numbered 1-99, the NCAA makes no stipulation on defensive players. Two players may also share the same number though they may not play during the same down.
The lowest numbers are often considered the most prestigious, and they are frequently worn not just by specialists and quarterbacks but also by running backs, defensive backs, and linebackers. Kickers and punters are frequently numbered in the 40s or 90s, which are the least in-demand numbers on a college roster. The increased flexibility in numbering of NCAA rosters is needed since NCAA rules allow larger rosters than the NFL; thus teams would frequently exhaust the available numbers for a position under the NFL rules. It is not uncommon for NCAA teams to have duplicate numbers, with an offensive player having the same number as a defensive one—this is allowed as long as both players are not on the field at the same time.

[yvonne]

I was looking for a better source, but could find only Wikipedia, which cites NCAA rulebook section 4 article 1

http://en.wikipedia.org/wiki/Uniform_num..._football)

Backs 1-49 Snapper 50-59 Guard 60-69 Tackle 70-79 End 80-99
Otherwise all player must be numbered 1-99, the NCAA makes no stipulation on defensive players. Two players may also share the same number though they may not play during the same down.
The lowest numbers are often considered the most prestigious, and they are frequently worn not just by specialists and quarterbacks but also by running backs, defensive backs, and linebackers. Kickers and punters are frequently numbered in the 40s or 90s, which are the least in-demand numbers on a college roster. The increased flexibility in numbering of NCAA rosters is needed since NCAA rules allow larger rosters than the NFL; thus teams would frequently exhaust the available numbers for a position under the NFL rules. It is not uncommon for NCAA teams to have duplicate numbers, with an offensive player having the same number as a defensive one—this is allowed as long as both players are not on the field at the same time.