In this paper, we describe JAMAP, a prototype of Web-based management platform for IP networks. It is entirely written in Java. It implements the push model to perform regular management (i.e. permanent network monitoring and data collection) and ad hoc management (i.e. temporary network monitoring and troubleshooting). The communication between agents and managers relies on HTTP transfers between Java applets and servlets over persistent TCP connections. The SNMP MIB data is encapsulated in serialized Java objects that are transmitted as MIME parts via HTTP. The manager consists of two parts: the management server, a static machine that runs the servlets, and the management station, which can be any desktop running a Web browser. The MIB data is transparently compressed with gzip, which saves network bandwidth without increasing latency too significantly.