Multicast IP Routing protocols are used to distribute data (for example, audio/video streaming broadcasts) to multiple recipients. Using multicast, a source can send a single copy of data to a single multicast address, which is then distributed to an entire group of recipients.

Does Netflix use multicast?

Since multicast is so much more efficient than unicast, large companies like Netflix and Youtube must be using this to stream videos right? ... The only place where you might see multicast on the Internet is your local ISP. They typically use multicast for IPTV to deliver video to their own customers.

What are some examples of multicast?

A simple example of multicasting is sending an e-mail message to a mailing list. Teleconferencing and videoconferencing also use multicasting, but require more robust protocols and networks. Standards are being developed to support multicasting over a TCP/IP network such as the Internet.