func PreviousIP(ip net.IP) net.IP {
	return NewNetworkNumber(ip).Previous().ToIP()
}
func PreviousIP(ip net.IP) net.IP {
	return NewNetworkNumber(ip).Previous().ToIP()
}
func PreviousIP ( ip net . IP ) net . IP { return NewNetworkNumber ( ip ) . Previous ( ) . ToIP ( ) }
// PreviousIP returns the previous sequential ip.
PreviousIP returns the previous sequential ip .