A method for communicating regional broadcast datagrams over a network in which the regional broadcast datagrams are routed using destination identifications wherein a sender terminal sends regional broadcast datagrams to a sub-network grouping server that selects a plurality of sub-network servers according to criteria defined by the sender terminal and chosen as a function of information derived from the sender terminal without the individual destination identifications of the destination terminals being specified by the sender terminal, and wherein the sub-network grouping server provides regional broadcast datagrams to the selected sub-network servers, which subsequently provide the regional broadcast datagrams to a plurality of destination terminals.