Which address is a multicast address?

The multicast address is defined as ff00::/8. Multicast addresses always start with ff. The link-local address is defined as fe80::/10. Any address starting with fe80 is nonroutable. A global unicast address is defined as 2000::/3. This provides a valid range of 2000:: to 3fff::. An address with a network prefix of fc00::/7 is a unique local unicast address. The network address fd00 would be part of the fc00::/7 network range.