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The  port numbers are divided into three ranges: the Well Known Ports, the Registered Ports, and the Dynamic and/or Private Ports. The Well Known Ports are those from  0 through 1023. The Registered Ports are those from 1024 through 49151. The  Dynamic and/or Private Ports are those from 49152 through 65535

The Well Known Ports are assigned by the IANA and on most systems can only be used by system (or root) processes or by  programs executed by privileged users.
Ports are used in the TCP [RFC793] to name the ends of logical connections which carry long term conversations. For the purpose of providing services to unknown callers, a service contact port is defined. This  list specifies the port used by the server process as its contact port. The contact port is sometimes called the "well-known port".
To the extent possible, these same port assignments are used with the UDP [RFC768].  The  assigned ports use a small portion of the possible port numbers. For many years  the assigned ports were in the range 0-255. Recently, the range for assigned  ports managed by the IANA has been expanded to the range 0-1023

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