Common Ports and Their Descriptions

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Port
TCP
UDP
Description
10
TCP
UDP
Unassigned
11
TCP
UDP
Active Users (systat service)
12
TCP
UDP
Unassigned
13
TCP
UDP
Daytime Protocol (RFC 867)
14
TCP
UDP
Unassigned
15
TCP
UDP
Previously netstat service
16
TCP
UDP
Unassigned
17
TCP
UDP
Quote of the Day
18
TCP
UDP
Message Send Protocol
19
TCP
UDP
Character Generator Protocol (CHARGEN)


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