PORT NUMBERS
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
21 FTP
25 SMTP
53 DNS
110 POP3
119 NNTP
More accurate and current information can be found athttp://www.isi.edu/in-notes/iana/assignments/port-numbers
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