The phrase "Internet of Things" (IoT) has been considered the next great prospect and a test for the Internet engineering community, technology users, society, and enterprises. The billions of physical devices are currently online, collecting and exchanging data globally. Anything as little as a pill or as large as an airliner can be made into a component of the IoT because of the development of affordable computer chips and the expansion of wireless networks. Devices that would otherwise be dumb are given a level of digital intelligence by connecting all these various components and attaching sensors to them, allowing them to communicate data in real time without human interaction. The difficulty of choosing the best wireless low-power area networks for IoT applications arises from the exponential expansion of wireless technologies connecting to the IoT. Therefore, this review investigates the importance of 6LoWPAN as a foundation for the IoT's future and reviews the history that led to IoT and the advantages of using 6LoWPAN-based IP networks. We also discuss the popular implementation and challenges of 6LoWPAN