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Well-known and Registered Ports
Port Number
Protocol
20
TCP
21
TCP
22
TCP & UDP
23
TCP
25
TCP
53
TCP & UDP
69
UDP
80
TCP
110
TCP
119
TCP
123
UDP
161
TCP
443
TCP & UDP
1503
TCP
1720
TCP
4000
TCP
7070
UDP
Description
FTP Data
FTP Control
SSH Remote Login Protocol
Telnet
SMTP (Simple Mail Transfer Protocol)
DNS (Domain Name Server)
TFTP (Trivial File Transfer Protocol)
World Wide Web HTTP
POP3 (Post Office Protocol Version 3)
NEWS (Network News Transfer Protocol)
NTP (Network Time Protocol)
SNMP
HTTPS
T.120
H.323
ICQ
RealAudio
113
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