The LoRaWAN® Regional Parameters specification defines the adaptation of the LoRaWAN® Link Layer specification to comply with the various regulations enforced throughout the world on the use of various frequency bands of unlicensed spectrum which are available. It defines default values for Link Layer parameters and channel plans. Each of the regional channel plans can be broadly characterized as dynamic channel plans, with a small number of default channels, or fixed channel plans, where all channels are defined then selectively activated by the network. Regional parameters are defined for a vast majority of countries in the world, using 9 main channel plans, and support for additional countries is regularly added.