2.1 Transport

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DirectPlay messages are transmitted either by UDP or TCP depending on whether the destination of the protocol message is broadcast or unicast. Clients of the DirectPlay 4 protocol MUST use TCP and UDP port numbers in the range from 2300 to 2400. Enumeration messages transmitted to the DirectPlay host computer MUST be transmitted to port 47624. Broadcast messages MUST be sent to the UDP broadcast address of 255.255.255.255.