I have experience of running PIM-SM on our LAN. I don't know about assigning multicast addresses on a WAN, but in a LAN, you as the network administrator should assign multicast groups to users.
You have correctly stated the address range of multicast groups, but you have to be very careful when assigning them. Basically, there is a 2^5 address ambiguity at the MAC address layer so many multicast IP addresses map to the same multicast MAC address. You should aim to assign addresses such that each multicast IP has a unique multicast MAC address. The other thing to watch out for when assigning multicast IP addresses is that they don't map to any of the IANA reserved addresses at the MAC level.
Sorry, I can't answer your second question, as I'm new to networking.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
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Introduction Featured Speakers Luis Espejel is the Telecommunications
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In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...