// "::/96"
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{}), 96),
		Precedence: 1,
		Label:      3,
	},
	{
		// "2001::/32"
		// Teredo
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{0x20, 0x01}), 32),
		Precedence: 5,
		Label:      5,
	},
	{
		// "2002::/16"
		// 6to4
		Prefix:     netip.PrefixFrom(netip.AddrFrom16([16]byte{0x20, 0x02}), 16),
		Precedence: 30,
		Label:      2,
	},

		if err == nil {
			ip = netip.AddrFrom4(from.Addr)
			port = from.Port
		}
	case syscall.AF_INET6:
		var from syscall.SockaddrInet6
		n, err = c.fd.readFromInet6(b, &from)
		if err == nil {
			ip = netip.AddrFrom16(from.Addr).WithZone(zoneCache.name(int(from.ZoneId)))
			port = from.Port
		}
	}
	if err == nil {
		addr = netip.AddrPortFrom(ip, uint16(port))
	}
	return n, addr, err
}

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.
func IPv6Loopback() Addr { return AddrFrom16([16]byte{15: 0x01}) }

			}
		})
	}

	// Addr constructors
	test("IPv4", func() { sinkIP = IPv4(1, 2, 3, 4) })
	test("AddrFrom4", func() { sinkIP = AddrFrom4([4]byte{1, 2, 3, 4}) })
	test("AddrFrom16", func() { sinkIP = AddrFrom16([16]byte{}) })
	test("ParseAddr/4", func() { sinkIP = panicIP(ParseAddr("1.2.3.4")) })
	test("ParseAddr/6", func() { sinkIP = panicIP(ParseAddr("::1")) })

	}
	var ret [16]byte
	for i, f := range fs {
		a, b, err := parseWord(f)
		if err != nil {
			return Addr{}, err
		}
		ret[i*2] = a
		ret[i*2+1] = b
	}

	return AddrFrom16(ret).WithZone(zone), nil
}

// normalizeIPv6Slow expands s, which is assumed to be an IPv6
// address, to its canonical text form.
//
// The canonical form of an IPv6 address is 8 colon-separated fields,

		return "?" + hexString(ip)
	}
	// If IPv4, use dotted notation.
	if p4 := ip.To4(); len(p4) == IPv4len {
		return netip.AddrFrom4([4]byte(p4)).String()
	}
	return netip.AddrFrom16([16]byte(ip)).String()
}

func hexString(b []byte) string {
	s := make([]byte, len(b)*2)
	for i, tn := range b {
		s[i*2], s[i*2+1] = hexDigit[tn>>4], hexDigit[tn&0xf]
	}
	return string(s)
}

		{"(Prefix).MarshalText", Method, 18},
		{"(Prefix).Masked", Method, 18},
		{"(Prefix).Overlaps", Method, 18},
		{"(Prefix).String", Method, 18},
		{"Addr", Type, 18},
		{"AddrFrom16", Func, 18},
		{"AddrFrom4", Func, 18},
		{"AddrFromSlice", Func, 18},
		{"AddrPort", Type, 18},
		{"AddrPortFrom", Func, 18},
		{"IPv4Unspecified", Func, 18},
		{"IPv6LinkLocalAllNodes", Func, 18},