É um link endereço local , usado para trocar tráfego com outras máquinas na mesma rede local. Cada interface Ethernet IPv6 atribui a si própria um endereço local de link com base em seu endereço de hardware.
Unlike IPv4, IPv6 requires a link-local address to be assigned to every network interface on which the IPv6 protocol is enabled, even when one or more routable addresses are also assigned. Consequently, IPv6 hosts usually have more than one IPv6 address assigned to each of their IPv6-enabled network interfaces. The link-local address is required for IPv6 sublayer operations of the Neighbor Discovery Protocol, as well as for some other IPv6-based protocols, like DHCPv6. -- Wikipedia