• A Network Protocol that allows a single source to send Data to multiple receivers simultaneously
  • Similar to Broadcasting, but more efficient because data is is only sent once, and then replicated by network to reach all receivers
  • When a source sends a multicast packet, it uses a Multicast IP address as the destination address. The network then replicates the packet and sends it to all of the receivers in the Multicast Group

Common Use Cases

Software Update

  • Used to distribute software updates to multiple devices simultaneously

Video Conferencing

  • Send audio and video streams to multiple participants in a video conference

Online Gaming

  • Send game state updates to multiple players simultaneously


Multicast IP address

  • IP Address in the range to

Multicast Group

  • A logical group for receivers who are interested in receiving Data from sender
  • Joining is done by sending an IGMP (Internet Group Management Protocol) join message to the network
  • Once a receiver has joined a multicast group, it will continue to receive all of the packets that are sent to that group, until it leaves the group