239.0.0.0 thru 239.255.255.255 make up the multicast limited scope (224.0.0.1-238.255.255.255 are classified as globally scoped meaning that these are taken up by various protocols/applications). As far as I know, there is no CIDR/subnet mask notation for addresses in the Class D space. You can assign the limited scope mulitcast group addresses at your own discretion (similar to RFC 1918 IP addresses). Remember, the Class D address is assigned to the group and the multicast PIM will allow unicast to muticast address mapping.
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