what is the radio code number?
How would any of US know YOUR radio’s code? It is keyed the the car itself and all are different.
keyed to vin number I think
Carl look in your manual or go to a Mercedes dealer with proof that the vehicle is yours. You are not going to get the code from the web.
And if this radio is from a different car ,ebay or junk yard purchase, you’ll need the VIN # from the car it came from and proof you legally purchased it.
Did you ever have work done at the dealer? If so, check if it’s listed on your receipt. I discovered that my Acura receipts had that information for my previous car, so maybe other makes do that as well.