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Software-defined networking (SDN) is a networking scenario which changes the traditional network architecture by bringing all control functionalities to a single location and making centralized decisions. Controllers are the brain of SDN architecture, which perform the control decision tasks while routing the packets. Centralized decision capability for routing enhances the network performance. Through this paper, we presented a review report on various available SDN controllers. Along with the SDN introduction, we discuss the prior work in the field. The review states how the centralized decision capability of the controller changes the network architecture with network flexibility and programmability. We also discuss the two categories of the controller along with some popular available controller. For each controller, we discuss the architectural overview, design aspects, and so on. We also evaluate the performance …