The subject matter disclosed herein provides methods for controlling loads in an IP network that is divided into one or more zones and/or subzones. In one aspect, there is provided a method that can associate a plurality of controllers with one of a plurality of zones. Each controller can be connected to one or more loads. The method can associate each controller with an address. The address can include a network address and a host identifier. The network address for each controller in a first zone can be the same. The method can transmit over a network a control message to each controller in the first zone. The control message can cause one or more operational parameters of the loads connected to each controller in the first zone to change. Related apparatus, computer program products, systems, techniques, and articles are also described.