Software-Defined Networking (SDN) is a relatively new paradigm for controlling and managing network devices. It can be defined by three main properties: separation of the network control plane from the data transmission plane, centralization of the network view and controlling functions, and offering open interfaces between the network devices and the network controller. The control plane enables the creation of a dedicated network operating system, which allows the setup of individual and flexible network configurations. Unified efforts of specialists from telecommunication and computer engineering domains have already resulted in successful SDN research projects, SDN simulation tools, development kits, SDN commercial devices and solutions. Deployments of software defined networks have appeared in experimental and production environments. Opening up the interfaces to network hardware enables more flexible and predictable network control, and makes it easier to extend the network with new functionalities. On the downside, this approach creates also new design problems. How to offer greater flexibility without compromising performance? How to design new applications that capitalize on the programmability of the network? How to achieve high reliability, scalability and security of software defined networks? How can we lower the barrier to creating, testing, and evaluating new applications, which work over a network operating system? How to provide SDN management and orchestration to satisfy both network users and operators? In the next decade, we can expect pervasive exploitation of processing, storage and networking resources: from smart things and devices to machines and vehicles, from small radio access networks to large multi-technology access infrastructures, from virtual middle-boxes to disaggregated service platforms. All this make SDN to be a very promising technology. The workshop aims to explore recent SDN research and developments and to help building a larger community to explore and realize the potential of software defined networks.