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Appendix C: Well-Known TCP/UDP Port Numbers
Port numbers are divided into three ranges: Well-Known Ports, Registered Ports, and
Dynamic and/or Private Ports. Well-Known Ports are those from 0 through 1023. Registered
Ports are those from 1024 through 49151. Dynamic and/or Private Ports are those from
49152 through 65535.
Well-Known Ports are assigned by IANA, and on most systems, can only be used by system
processes or by programs executed by privileged users. The table below shows some of the
well-known port numbers. For more details, please visit the IANA website: http://www.iana.
org/assignments/port-numbers.
PortNumber Protocol TCP/UDP
21 FTP (File Transfer Protocol) TCP
22 SSH (Secure Shell) TCP
23 Telnet TCP
25
SMTP (Simple Mail Transfer
Protocol)
TCP
37 Time TCP, UDP
39
RLP (Resource Location
Protocol)
UDP
49 TACACS, TACACS+ UDP
53 DNS UDP
67 BOOTP server UDP
68 BOOTP client UDP
69 TFTP UDP
70 Gopher TCP
79 Finger TCP
80 HTTP TCP
110 POP3 TCP
119
NNTP (Network News
Transfer Protocol)
TCP
161/162 SNMP UDP
443 HTTPS TCP