Anycast addresses are taken from the global unicast address space, and are not otherwise distinguishable from unicast addresses.///
The Unspecified Address///
The address 0:0:0:0:0:0:0:0 is called the unspecified address and indicates the absence of an address. It serves as a place holder and must never actually be assigned to a node. As an example of its use, the Source Address field of an IPv6 packet sent by an initializing host before it has learned its own address carries the unspecified address.