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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.
Ports with numbers 0–1023 are called system or well-known ports; ports with numbers 1024-49151 are called user or registered ports, and ports with numbers 49152-65535 are called dynamic, private or ephemeral ports. [2] Both system and user ports are used by transport protocols (TCP, UDP, DCCP, SCTP) to identify an application or service.
TCP- and UDP-based protocols: List of TCP and UDP port numbers: Automation: List of automation protocols: Bluetooth: List of Bluetooth protocols: File transfer: Comparison of file transfer protocols: Instant messaging: Comparison of instant messaging protocols: Internet Protocol: List of IP protocol numbers: Link aggregation: List of Nortel ...
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 ...
This includes the registration of commonly used TCP and UDP port numbers for well-known internet services. The port numbers are divided into three ranges: the well-known ports, the registered ports, and the dynamic or private ports. The well-known ports (also known as system ports) are those numbered from 0 through 1023. The requirements for ...
This article lists protocols, categorized by the nearest layer in the Open Systems Interconnection model.This list is not exclusive to only the OSI protocol family.Many of these protocols are originally based on the Internet Protocol Suite (TCP/IP) and other models and they often do not fit neatly into OSI layers.
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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]