Why do class D doesnt have subnetmask

[gs5730]

Hello, why do class D doesnt have subnetmask

 

[c911darkwolf]

Class D is a multicast Network. Its not like a traditional Class A, B, C. A Multicast network sends data to multiple targets and not just one..

I.E. Normall Computer A request Data from Server A and server A sends it back to Computer A.

In Multicast. Computer A request data from server A and Server A sends it to all Computers in VLAN A.

Since it's a multicast system it makes it different.