In addition, some applications, such as VPN clients, can use multiple ports simultaneously. Why do you need to know the port numbers?Ĭertain programs may use different types of ports, so when setting up firewalls or giving applications certain permissions, it may be useful to scan port numbers. UDP ports: when using the UDP protocol (User Datagram Protocol), data packets are sent without a previously established connection, which increases the data transfer speed. TCP ports: when using the TCP protocol (Transmission Control Protocol), before sending data, a port establishes a connection, which makes it more reliable. What is the difference between UDP and TCP ports? The socket is often called a transport layer address and looks like 81.143.28.57:2039, where 81.143.28.57 is an IP address with the port number 2039. This distribution significantly reduces the time for data exchange.Ī set of IP addresses and network port numbers is called a socket. The IANA organization regulates and approves standards of actions with ports. Many popular protocols have standard port values assigned to them.
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