RFC 6335 - Internet Assigned Numbers Authority (IANA

Lastly, there is a range of ports from port 49152-65535. These are known as Ephemeral ports (or private ports). Ephemeral ports can’t be enlisted with IANA and are commonly utilized for setting up outbound network traffic and connections. All TCP traffic needs one destination port and one source port to establish a connection. Port 2195 (tcp/udp) :: SpeedGuide Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services. Well Known Ports: 0 through 1023. Registered Ports: 1024 through 49151. Common TCP/UDP Ports Used By Red Hat Enterprise Linux Jan 24, 2016

Example 14.1 shows that UDP ports are often registered for TCP-only services such as SSH and FTP. This was inherited from the IANA, who tend to always register services for both protocols. Having the extra entries doesn't hurt, because by default Nmap scans ports with the highest frequencies and low-frequency ports are simply skipped.

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Various TCP and UDP ports - GeeksforGeeks

Online TCP UDP port finder - adminsub.net TCP is one of the main protocols in TCP/IP networks. TCP is a connection-oriented protocol, it requires handshaking to set up end-to-end communications. Only when a connection is set up user's data can be sent bi-directionally over the connection. Attention! TCP guarantees delivery of data packets on port 63407 in the same order in which they