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About multicast IP addresses and ports

Multicast IP addresses are class D addresses that fall within two ranges: through and FF00:0000:0000:0000:0000:0000:0000:0000 through FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF. The addresses in the first range are Internet Protocol version 4 (IPv4) addresses, which is the current version of the Internet Protocol. The addresses in the second range are IPv6 addresses, which is the new version of the protocol. For more information about implementing IPv6 addresses on your server, see Windows Help and Support.

For intranet use, it is recommended that you use IPv4 addresses in the range 239.*.*.*. Port numbers can range between 1 and 65535. The routers on the network over which you are transmitting your content must be multicast-enabled, meaning that they must be able to interpret class D addresses or they will not be able to forward your multicast information to clients.

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