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This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.
23 TRUNK-1 Trunk-1 0x18 24 TRUNK-2 Trunk-2 0x19 25 LEAF-1 Leaf-1 0x1A 26 LEAF-2 Leaf-2 0x1B 27 RDP Reliable Data Protocol: RFC 908: 0x1C 28 IRTP Internet Reliable Transaction Protocol: RFC 938: 0x1D 29 ISO-TP4 ISO Transport Protocol Class 4 RFC 905: 0x1E 30 NETBLT Bulk Data Transfer Protocol: RFC 998: 0x1F 31 MFE-NSP MFE Network Services ...
RakNet is a C++ class library that provides UDP and reliable TCP transport. It contains several core systems that rely on the transport layer: object replication; Remote procedure call in C++ using Boost C++ Libraries; VoIP supporting FMOD, DirectSound, and PortAudio; NAT traversal; and Patch. [clarification needed]
TCP uses 16-bit port numbers, providing 65,536 possible values for each of the source and destination ports. [17] The dependency of connection identity on addresses means that TCP connections are bound to a single network path; TCP cannot use other routes that multihomed hosts have available, and connections break if an endpoint's address changes.
The "Server port" column indicates the port from which the server transmits data. In the case of FTP, this port differs from the listening port. Some protocols—including FTP, FTP Secure, FASP, and Tsunami—listen on a "control port" or "command port", at which they receive commands from the client.
The most common transport protocols that use port numbers are the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP); those port numbers are 16-bit unsigned numbers. A port number is always associated with a network address of a host, such as an IP address, and the type of transport protocol used for communication. It ...
In the TCP case, a flow may be a virtual circuit, also known as a virtual connection or a byte stream. [4] In packet switches, the flow may be identified by IEEE 802.1Q Virtual LAN tagging in Ethernet networks, or by a label-switched path in MPLS tag switching. Packet flow can be represented as a path in a network to model network performance.
Listing open TCP ports that are listening on the local machine. In security parlance, the term open port is used to mean a TCP or UDP port number that is configured to accept packets. In contrast, a port which rejects connections or ignores all packets directed at it is called a closed port. [1]