net

func Contains(n *net.IPNet, ip net.IP) bool

func IPString(ip net.IP) string

func IsLoopback(ip net.IP) bool

func IsMulticast(ip net.IP) bool

func IsNil(ip net.IP) bool

func IsPrivate(ip net.IP) bool

func JoinHostPort(host string, port string) string

func LookupHost(host string) ([]string, error)

func ParseCIDR(s string) (*net.IPNet, error)

func ParseIP(s string) net.IP

func SplitHostPort(hostport string) (string, string, error)