This paper addresses one of the RPL routing attacks - Rank attack, which is a fundamental security attack on the routing of in IoT networks. Today, most devices, which are used for health care, connected vehicles and smart buildings have the capability to be connected to the internet through wireless. The IoT devices use routing protocols such as RPL and 6LoWPAN. The major challenge within IoT is that the devices are resource constrained, the communication links are low power and lossy, which makes it more vulnerable to attacks. This paper presents a detailed investigation on the various algorithms developed to detect the rank attack in IoT. An Intrusion detection system (IDS) is designed for IoT, which is capable of detecting Rank attack and attacker node. This system is used to identify the Rank attack, attacker nodes based on the location information of node rank, neighboring node rank and its respective rank value, usual signal strength. The plan of this system is helping in securing the IoT network and prevent from some attacks [2]. However, applying usual IDS techniques to IoT is difficult due to its particular characteristics such as constrained-resource devices, specific protocol stacks. In this paper, present a survey of IDS research efforts for IoT. Main objective is to identify rank attack and future research possibilities to detect rank attack by using IDS Technique. © 2018 IEEE.