Identify the class and subnet of this IP adress ; 17.11.11.11

According to  the clasification of Classes

 IP Address Belongs to Class A and subnet ID is 17.0.0.0

But it can be customized if you can provide subnet mask or reserved bits then it will be easy and cleared answer As we can customize the address and can change class and use any class address as per our requirement.

Class A address. subnet ID is.0.0.0