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APPENDIX D: Connectivity, TCP Ports and Serial I/O
DB9F-RJ45S cross-over connector
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. On most systems, they 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, visit the IANA
website: http://www.iana.org/assignments/port-numbers.
Port Number 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, UCP
39 RLP (Resource Location Protocol) UDP
49 TACACS, TACACS+ UDP
53 DNS UDP
67 BOOTP server UDP
68 BOOTP client UDP
v69 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
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