Multicast addresses
Class D addresses: 224.0.0.0 thru’ 239.255.255.255
Each multicast address represents a group of arbitrary size, called a “host group”
There is no structure within class D address space like subnetting => flat address space
Addresses 224.0.0.x and 224.0.1.x are reserved. See assigned numbers RFC 1700
- Eg: 224.0.0.2 = all routers on this subnet
Addresses 239.0.0.0 thru 239.255.255.255 are reserved for private network (or intranet) use