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TCP/UDP Port List
[Introduction]
[Well Known Ports]  [Dynamic Ports]
[ICMP List]
Well-Known Port - A TCP or UDP port with a number in the range 0-1023 (originally 0-255). The well-known port numbers are assigned by the IANA (Internet Assigned Numbers Authority) and on most systems can only be used by system (or root) processes or by programs executed by privileged users.TCP (Transmission Control Protocol) The most common transport layer protocol used on Ethernet and the Internet. UDP - (User Datagram Protocol) Internet standard network layer, transport layer and session layer protocols which provide simple but unreliable datagram services. Dynamic Port - The dynamic port numbers (also known as the private port numbers) are the port numbers that are available for use by any application to use in communicating with any other application, using the Internet's Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP). When one application communicates with another application at another host computer on the Internet, it specifies that application in each data transmission by using its port number. The port numbers range from 0 through 65535. However, certain port numbers - the well-known port numbers and the registered port numbers - are registered and administered by the Internet Corporation for Assigned Names and Numbers (ICANN) for use by certain classes of applications. The dynamic port numbers are in the highest range, from 49152 through 65535. ICMP - (Internet Control Message Protocol) An extension to the Internet Protocol (IP) that allows for the generation of error messages, test packets, and informational messages related to IP.Registered Port - Any TCP or UDP port with a number in the range 1025 to 65535 (i.e. not a well-known port) that is registered with IANA. IANA - Internet Assigned Numbers Authority - (IANA) The central registry for various "assigned numbers": Internet Protocol parameters, such as port, protocol, and enterprise numbers; and options, codes, and types. | 
