Ephemeral port
networking
A TCP or UDP port number that is automatically allocated from a predefined range by the TCP/IP stack software, typically to provide the port for the client end of a client-server communication.
BSD used ports 1024 through 4999 as ephemeral ports, though it is often desirable to increase this allocation.
(http://ncftpd.com/ncftpd/doc/misc/ephemeral_ports.html).
(2002-10-06)
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