func IsValidIPAddress(ip string) bool {
	ipa, err := netip.ParseAddr(ip)
	if err != nil {
		return false
	}
	return ipa.IsValid()
}

// IsIPv6Address returns if ip is IPv6.
func IsIPv6Address(ip string) bool {
	ipa, err := netip.ParseAddr(ip)
	if err != nil {
		return false
	}
	return ipa.Is6()
}

// IsIPv4Address returns if ip is IPv4.
func IsIPv4Address(ip string) bool {

			args: args{
				ip: "2001:db8:::1",
			},
			want: false,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			if got := IsIPv6Address(tt.args.ip); got != tt.want {
				t.Errorf("IsIPv6Address() = %v, want %v", got, tt.want)
			}
		})
	}
}

func TestIsIPv4Address(t *testing.T) {
	type args struct {
		ip string
	}
	tests := []struct {

				if endpointAddress == "" {
					endpointAddress = model.LocalhostAddressPrefix
				}
			} else if hostIP == model.PodIPv6AddressPrefix {
				for _, proxyIPAddr := range cb.proxyIPAddresses {
					if netutil.IsIPv6Address(proxyIPAddr) {
						endpointAddress = proxyIPAddr
						break
					}
				}
				// if there is no any IPv6 address in proxyIPAddresses
				if endpointAddress == "" {