The DY-1100 class was a type of Earth ship.

In 2372, Chief Miles O'Brien identified the Alerica as a DY-1100 class, although Worf pointed out it was actually a much older DY-700 class ship. (DS9 novel: The 34th Rule)

Starship classes of Earth
Arrow • Assist • Cavalry • Christopher • Cosmos • DY-100 • DY-500 • DY-700 • DY-1100-class • Daedalus • Discovery • Doppler (scout) • Edison • Galliant • Hopkins • Horizon • Intrepid (Earth) • J (freighter) • Long • Marshall • Mercury • Messier • Minuteman • NX • Poseidon • Strider • Vanguard (starship) • Verne • Y (freighter) • Yorktown • Zeus