Unlike the prehistoric IPv4 protocol which relies on DHCP servers to be able to communicate and do anything useful, the modern IPv6 protocol is much more self-sufficient and in tune with 2012.
Introducing IPv6 Stateless Address Autoconfiguration or SLAAC. Described in RFC 4862 SLAAC is a mechanism that:
“requires no manual configuration of hosts, minimal (if any) configuration of routers, and no additional servers. The stateless mechanism allows a host to generate its own addresses using a combination of locally available information and information advertised by routers”
In Apple terms; it’s like magic!