Common Ports and Their Descriptions

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Port
TCP
UDP
Description
35
TCP
UDP
Any private printer server protocol
37
TCP
UDP
TIME protocol
39
TCP
UDP
Resource Location Protocol (RLP)—used for determining the location of higher level services from hosts on a network
40
TCP
UDP
Unassigned
42
TCP
UDP
ARPA Host Name Server Protocol
42
TCP
UDP
Windows Internet Name Service
43
TCP
 
WHOIS protocol
47
TCP
UDP
NI FTP
49
TCP
UDP
TACACS Login Host protocol
50
TCP
UDP
Remote Mail Checking Protocol


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