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App-17
IM DL350-01EN
Appendix 7 TCP and UDP Port Numbers
The TCP and UDP port numbers that are used on the Ethernet interface of the instrument are listed below.
TCP Port Numbers
Port Number
Description
Used For
20
File Transfer [Default Data]
FTP client,
*
and a portion of the Web server
21
File Transfer [Control]
FTP client,* and a portion of the Web server
25
Simple Mail Transfer Protocol
SMTP client
80
World Wide Web HTT
Web server and WebDAV server
515
−
LPR client
111
1024
1025
10002 (send)
−
Instrument control through the Ethernet
interface
UDP Port Numbers
Port Number
Description
Used For
67
Bootstrap Protocol Server
DHCP client
68
Bootstrap Protocol Client
(listen port)
123
Network Time Protocol
SNTP client
* The port number when FTP passive mode is disabled. When FTP passive mode is enabled, you can set any
port number. When FTP passive mode is disabled, connections are established from the server. If you are
connecting the instrument from behind a firewall, enable FTP passive mode.
Appendix