Multicast: start with ffidentifier for a group of interfaces, a packet sent to a multicast address is delivered to all of these interfaces with this address.With IPv6 there is no broadcast address.
IPV6 Addresses - Prefix
FC00 – FD
Standard internal IP
FEC0 - FEFF
Multicast makes it possible in IP networks to efficiently send packets to many recipients at the same time. This happens with a special multicast address.