Antoine Dupont, the French rugby scrum-half, is generally listed at about 5 feet 9 inches tall (around 1.74 m) on major rugby and sports bio sites.

Because you only wrote “dupont,” there are a few things this could mean (a person, a building, or a place named DuPont). In most current sports and forum discussions, though, “Dupont” almost always refers to Antoine Dupont, and fan comments also repeatedly peg him at roughly 5'9".