},
		{
			name: "IPv6 link-local all nodes",
			ip:   IPv6LinkLocalAllNodes(),
			std:  net.IPv6linklocalallnodes,
		},
		{
			name: "IPv6 link-local all routers",
			ip:   IPv6LinkLocalAllRouters(),
			std:  net.IPv6linklocalallrouters,
		},
		{
			name: "IPv6 loopback",
			ip:   IPv6Loopback(),
			std:  net.IPv6loopback,
		},
		{
			name: "IPv6 unspecified",
			ip:   IPv6Unspecified(),

	IPv6interfacelocalallnodes = IP{0xff, 0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01}
	IPv6linklocalallnodes      = IP{0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01}
	IPv6linklocalallrouters    = IP{0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x02}
)

// IsUnspecified reports whether ip is an unspecified address, either
// the IPv4 address "0.0.0.0" or the IPv6 address "::".

// address ff02::1.
func IPv6LinkLocalAllNodes() Addr { return AddrFrom16([16]byte{0: 0xff, 1: 0x02, 15: 0x01}) }

// IPv6LinkLocalAllRouters returns the IPv6 link-local all routers multicast
// address ff02::2.
func IPv6LinkLocalAllRouters() Addr { return AddrFrom16([16]byte{0: 0xff, 1: 0x02, 15: 0x02}) }

// IPv6Loopback returns the IPv6 loopback address ::1.