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
Some of the most common well know port numbers are
More accurate and current information can be found athttp://www.isi.edu/in-notes/iana/assignments/port-numbers
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