Providing multicast support for mobile hosts in an IP inter-network must face many challenging problems, such as compatibility with existing multicast protocols (implicitly assume static hosts), mobility management, scalability, etc. This paper, we propose a new mobile multicast protocol, called Mobile Scalable Recursive Multicast (MoSReM). MoSReM is based on the concept of dynamic branching node-based tree (DBT), setting up multicast tree gradually and dynamically. In MoSReM, only branching nodes router (BNRs) keep the multicast state about their next BNRs and mobility information (if any) about destinations, and the process of join/leave and mobility management of members of a multicast session is always carried out locally. MoSReM has many positive features such as fixed size control message, being scalable and low join/leave latency.