What is class D default sub net mask?

Answer 1

Seems to me, I'm still learning, that the Class D subnet mask would be 224.0.0.0 or 1110 0000.0000 0000.0000 0000.0000 0000 in binary. The internet has been using classless subnets for a while now, so it may not be as relevant as it once was.

Answer 2

There isn't a standard subnet mask for class D. Class D is for multi-casting, and requires group membership, and other things. This link may help with that information:

http://technet.microsoft.com/en-us/library/cc739600(WS.10).aspx

Answer 3

The default subnet mask for a Class C network is 255.255.255.0. This is sometimes expressed as A.B.C.D/24 where the /24 represents the 24 bits of the subnet mask.

Answer 4

Used for multicast, the subnet mask is 224.0.0.0