This article needs additional citations for. Unsourced material may be challenged and removed. (June 2015) () This is a list of TCP and UDP port numbers used by protocols of the of the for the establishment of host-to-host connectivity. Originally, were used by the (NCP) in the for which two ports were required for transmission.

Later, the (TCP) and the (UDP) needed only one port for full-duplex, bidirectional traffic. The even-numbered ports were not used, and this resulted in some even numbers in the well-known port number range being unassigned. The (SCTP) and the (DCCP) also use port numbers.

They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist. The (IANA) is responsible for maintaining the official assignments of port numbers for specific uses.

However, many unofficial uses of both well-known and registered port numbers occur in practice. Similarly many of the official assignments refer to protocols that were never or are no longer in common use. This article lists port numbers and their associated protocols that have experienced significant uptake. This section gives without describing their significance in the context of the article. Please help by that describe the examples' significance, and by removing less pertinent examples. Or poorly sourced material may be challenged or removed.

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(October 2016) () The port numbers in the range from 0 to 1023 are the well-known ports or system ports. Albers Kamiu Svetimas Pdf Merge. They are used by system processes that provide widely used types of network services.

On operating systems, a process must execute with privileges to be able to bind a to an using one of the well-known ports. Well-known ports Port TCP UDP Description IANA status 0 N/A N/A In programming APIs (not in communication between hosts), requests a system-allocated (dynamic) port N/A 0 Reserved Reserved Reserved Official 1 TCP Assigned (TCPMUX).