TCP/UDP Port List
[Introduction] [Well Known
Ports] [Dynamic
Ports] [ICMP
List]
Registered Ports
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.
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