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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.
An application binds a socket to its endpoint of data transmission, which is a combination of an IP address and a port. In this way, UDP provides application multiplexing. A port is a software structure that is identified by the port number, a 16-bit integer value, allowing for port numbers between 0 and 65535. Port 0 is reserved but is a ...
The original netcat's features include: [2] Outbound or inbound connections, TCP or UDP, to or from any ports; Full DNS forward/reverse checking, with appropriate warnings; Ability to use any local source port; Ability to use any locally configured network source address; Built-in port-scanning capabilities, with randomization
The use of UDP helper addresses can cause issues with some Windows-based network configurations.. [2] According to Microsoft these issues stem from the fact that ports 137,138 are forwarded by default on Cisco routers. Since these ports are used by NetBIOS to help determine network configuration the added broadcasts can confuse the system.
The Stream Control Transmission Protocol (SCTP) is a computer networking communications protocol in the transport layer of the Internet protocol suite.Originally intended for Signaling System 7 (SS7) message transport in telecommunication, the protocol provides the message-oriented feature of the User Datagram Protocol (UDP), while ensuring reliable, in-sequence transport of messages with ...
discard stream tcp nowait root internal discard dgram udp wait root internal The Discard Protocol is the TCP/UDP equivalent of the Unix file-system node /dev/null . Such a service is guaranteed to receive what is sent to it and can be used for debugging code requiring a guaranteed reception TCP or UDP payloads.
SABUL was later renamed to UDT starting with version 2.0, which was released in 2004. UDT2 removed the TCP control connection in SABUL and used UDP for both data and control information. UDT2 also introduced a new congestion control algorithm that allowed the protocol to run "fairly and friendly" with concurrent UDT and TCP flows.
The port mapper (rpc.portmap or just portmap, or rpcbind) is an Open Network Computing Remote Procedure Call (ONC RPC) service that runs on network nodes that provide other ONC RPC services. Version 2 of the port mapper protocol maps ONC RPC program number/version number pairs to the network port number for that version of that program.