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Ephemeral port range3/18/2023 ![]() ![]() The RFC 6056 says that the range for ephemeral ports should be 1024–65535. Ephemeral ports are also called dynamic ports, because they are used on a per request basis, and are only known by number once allocated. ![]() After completion of the session, the port is destroyed and the port number becomes available for reuse, but many implementations simply increment the last used port number until the ephemeral port range is exhausted, when the numbers roll over. The allocation of an ephemeral port is temporary and only valid for the duration of the communication session. For example, the Trivial File Transfer Protocol (TFTP) and Remote Procedure Call (RPC) applications can behave in this manner. At the server end of the communication session, ephemeral ports may also be used for continuation of communications with a client that initially connected to one of the services listening with a well-known port. The Transmission Control Protocol (TCP), the User Datagram Protocol (UDP), and the Stream Control Transmission Protocol (SCTP) typically use an ephemeral port for the client-end of a client–server communication. Such short-lived ports are allocated automatically within a predefined range of port numbers by the IP stack software of a computer operating system. Short-lived transport protocol port for IP communicationsĪn ephemeral port is a communications endpoint ( port) of a transport layer protocol of the Internet protocol suite that is used for only a short period of time for the duration of a communication session. ![]()
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