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Appendix B: Well-known Port Numbers

The port numbers are divided into three ranges: the Well Known Ports, the Registered Ports, and the

Dynamic and/or Private Ports. The Well Known Ports are those from 0 through 1023. The Registered

Ports are those from 1024 through 49151. The Dynamic and/or Private Ports are those from 49152

through 65535.

The Well Known Ports are assigned by the IANA, and on most systems, can only be used by system

processes or by programs executed by privileged users. Table B-1 shows famous port numbers

among the well-known port numbers. For more details, please visit IANA website:

http://www.iana.org/assignments/port-numbers

Table B-1 Well-known 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, 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

1 2 ... 38 39 40 41 42 43 44 45 46 47 48

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Sena LS100 User Manual Page 43