If you mean Can u do IP multicast with TCP no plain TCP requires the sender receiver to establish a 3 way handshake and this is only between two parties TCP also uses other mechanisms for flow control etc which are geared towards a two party only config Having said that TCP maybe used to setup multicast topologies in higher layers see above discussions on IRC etc There might also be other reliable possiblly connection oriented layer 4 protocols that support IP multicast 203 173 11 157