![]() # are included, only the more common ones. # Updated from RFC 1700, ``Assigned Numbers'' (October 1994). # even if the protocol doesn't support UDP operations. # port number for both TCP and UDP hence, most entries here have two entries # Note that it is presently the policy of IANA to assign a single well-known Network Services and Ports # /etc/services: 49152-65535 – the Dynamic Ports, also referred to as the Private Ports.1024-49151 – the Registered Ports, also known as User Ports.0-1023 – the Well Known Ports, also referred to as System Ports.In addition, a combination of an IP address, port and protocol such as TCP/UDP is known as a socket, and every service must have a unique socket.īelow are the different categories of ports: The two most popular Internet transport protocols, Transmission Control Protocol ( TCP) and the User Datagram Protocol ( UDP) and other less known protocols use port numbers for communication sessions (source and destination port numbers in conjunction with the source and destination IP addresses). It is a 16-bit number ( 0 to 65535) which differentiates one application from another on end systems. In computer networking, and more definitely in software terms, a port is a logical entity which acts as a endpoint of communication to identify a given application or process on an Linux operating system. In this article, we will briefly talk about ports in computer networking and move to how you can list all open ports in Linux.
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