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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.
This protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23 or 2323, where a Telnet server application is listening. [3] [9] [10] The Telnet protocol abstracts any terminal as a Network Virtual Terminal (NVT). The client must simulate a NVT using the NVT codes when messaging the server.
For TCP, port number 0 is reserved and cannot be used, while for UDP, the source port is optional and a value of zero means no port. A process associates its input or output channels via an internet socket , which is a type of file descriptor , associated with a transport protocol , a network address such as an IP address , and a port number.
allowing client applications to use dynamic ephemeral TCP/UDP ports to communicate with the known ports used by the server applications, even though a firewall configuration may allow only a limited number of known ports. In the absence of an ALG, either the ports would get blocked or the network administrator would need to explicitly open up a ...
Ports of the State (Spanish: Puertos del Estado) is a State-owned company responsible for the management of Spanish state-owned ports.The company executes the port policy of the Government and coordinates and controls the efficiency of the port system, made up of 28 Port authorities that manage the 46 ports of general interest.
.es (españa) is the country code top-level domain (ccTLD) for Spain.It is administered by the Network Information Centre of Spain. Registrations are permitted at the second level or at the third level beneath various generic second level categories. Some qualifications and restrictions apply to thi
NAT Port Mapping Protocol (NAT-PMP) is a network protocol for establishing network address translation (NAT) settings and port forwarding configurations automatically without user effort. [1] The protocol automatically determines the external IPv4 address of a NAT gateway, and provides means for an application to communicate the parameters for ...
Map showing the location of the ports listed on this page. The following is a list of the ports in Spain declared to be of "general interest" and thus, under the exclusive competence of the General Administration of the State. [1]