The First Order Dreadnought is a Mandator-IV dreadnought used by the First Order during their conflict with the Resistance in Star Wars: The Last Jedi. It acts as an orbital gun platform, and had access to two orbital guns as well as 24 cannons on the ventral side, which are comparatively flat.
Length 7,669.72 meters (25,162.8 feet)
2 orbital autocannons
24 surface cannons