If you look in the back of the owners manual it should tell you the names of all the colours for that particular model year. If you don't have the owners manual it's available
by clicking on this link and downloading it
Once you know the name of the colour, you can go to a paint factor who stocks PPG paints (PPG are the paint manufacturer that Ducati use) and they will have the right colour codes and the colour formula so they'll be able to make it up for you. You can contact PPG the UK on 01753 611500 if you want to find a local stockist.
For the DIY market, they should be able to make up aerosols if you don't have a compressor and spray gun, and you'll most likely find that the finish is what's called base coat and lacquer where you build up 4 or 5 coats of base colour, flat it back to a matt finish with 1500 grade wet & dry, then squirt clear lacquer over it to make it glossy again.
DIY aerosols are OK, but they don't give you a huge amount of chip resistance, so if you're doing anywhere that might suffer from stone chips you might be better off biting the bullett and getting it done professionally. They'll use two-pack paint and two pack lacquer which is epoxy based and much harder. They won't sell you that if you are a DIY'er because it gives off poisonous fumes until it's cured so you need to have some sort of license to prove you've got a suitably equipped spray booth and breathing equipment.