Abstract: A service is provided on a data network. The data network comprises a plurality of clients and one or more servers. Each specific client has a specific network address. In a database, respective groups are formed of the network addresses. Each respective group has a respective profile. Each respective profile is determined by one or more respective commonalities in requests sent by the clients to the one or more servers over a period of time. Each specific network address is grouped in at least one specific group based on the requests sent by the specific client and matching a specific profile.